Garage Billing System

To create a billing system for the garage, we can outline the key features and functionality. Here's a plan for setting up a basic billing system:

1. Customer Information

Name: To identify the customer.
Contact Details: Phone number or email for communication.
Vehicle Information: Vehicle make, model, license plate number.

2. Services Provided

Service Description: Type of service performed (e.g., oil change, tire replacement, repairs).
Service Cost: Cost for each service performed.

3. Parts Used

Parts Description: List of any parts replaced (e.g., filters, tires, brakes).
Parts Cost: Cost for each part used.

4. Additional Fees

Labor Charges: Depending on the time spent on the service.
Miscellaneous Fees: Any other applicable fees like disposal fees or diagnostic charges.

5. Total Calculation

Total cost = Service cost + Parts cost + Labor charges + Miscellaneous fees.

6. Billing and Payment

Invoice Number: Unique identifier for each invoice.
Date of Service: Date the service was provided.
Payment Status: Whether the bill has been paid, pending, or partially paid.

7. Print or Generate Invoice

Once everything is filled out, the system should allow the creation of a printable invoice for the customer.

Would you like to build a simple database schema for this, or are you focusing on designing a front-end form for billing? Let me know how you want to proceed!

Great! Let's start by designing the front-end for the garage billing system. Here's how the user interface can be laid out:

Front-End Layout: Garage Billing System

1. Customer Information Section

Customer Name:
- Input field (Text)
Contact Information:
- Phone number (Text)
- Email address (Text)
Vehicle Information:
- Vehicle Make (Dropdown)
- Vehicle Model (Text)
- License Plate (Text)

2. Service Provided Section

Services:
- Dropdown or multi-select list for different services offered (e.g., oil change, tire repair, brake replacement, etc.)
- Option to add a custom service if needed.
Cost for Services:
- Numeric input field for service charges.

3. Parts Used Section

Parts List:
- Dropdown for parts available in the garage (e.g., tires, filters, spark plugs).
- Input for the quantity of parts used.
- Numeric field for the cost of each part.
- Button to add parts to the bill.

4. Additional Fees Section

Labor Charges:
- Input for the number of hours spent on the job.
- Numeric input for labor rate per hour.
Miscellaneous Fees:
- Input for other applicable fees (e.g., disposal fee, diagnostic fee).

5. Total Calculation Section

Summary of Charges:
- Auto-calculate the total price based on entered data (services, parts, labor, miscellaneous fees).
- Display the total cost for the customer.

6. Payment Information Section

Payment Status:
- Dropdown for payment status (Paid, Pending, Partially Paid).
Payment Method:
- Dropdown or radio buttons for payment method (Cash, Credit, Bank Transfer).
Payment Amount:
- Numeric field to enter the amount paid.

7. Invoice Generation

Invoice Button:
- Once all the details are filled, the user can click to generate the invoice.
Download or Print:
- Option to download the invoice as a PDF or print it directly.

HTML Structure (Example)

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Garage Billing System</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="billing-form">
        <h1>Garage Billing System</h1>

        <form action="submit_invoice.php" method="post">
            <!-- Customer Information Section -->
            <div class="section">
                <h2>Customer Information</h2>
                <label for="customer-name">Customer Name:</label>
                <input type="text" id="customer-name" name="customer_name" required>

                <label for="contact-info">Contact Information:</label>
                <input type="text" id="phone" name="phone" placeholder="Phone Number">
                <input type="email" id="email" name="email" placeholder="Email Address">

                <label for="vehicle-make">Vehicle Make:</label>
                <select id="vehicle-make" name="vehicle_make" required>
                    <option value="">Select Make</option>
                    <option value="Toyota">Toyota</option>
                    <option value="Honda">Honda</option>
                    <!-- Add more options here -->
                </select>

                <label for="vehicle-model">Vehicle Model:</label>
                <input type="text" id="vehicle-model" name="vehicle_model" required>

                <label for="license-plate">License Plate:</label>
                <input type="text" id="license-plate" name="license_plate" required>
            </div>

            <!-- Service Section -->
            <div class="section">
                <h2>Service Provided</h2>
                <label for="service">Services:</label>
                <select id="service" name="service" multiple>
                    <option value="oil_change">Oil Change</option>
                    <option value="tire_replacement">Tire Replacement</option>
                    <!-- Add more options here -->
                </select>

                <label for="service-cost">Service Cost:</label>
                <input type="number" id="service-cost" name="service_cost" required>
            </div>

            <!-- Parts Section -->
            <div class="section">
                <h2>Parts Used</h2>
                <label for="part">Parts:</label>
                <select id="part" name="part">
                    <option value="filter">Filter</option>
                    <option value="brakes">Brakes</option>
                    <!-- Add more parts here -->
                </select>

                <label for="part-quantity">Quantity:</label>
                <input type="number" id="part-quantity" name="part_quantity" min="1">

                <label for="part-cost">Cost per Part:</label>
                <input type="number" id="part-cost" name="part_cost">
                
                <button type="button" onclick="addPart()">Add Part</button>
            </div>

            <!-- Additional Fees Section -->
            <div class="section">
                <h2>Additional Fees</h2>
                <label for="labor-hours">Labor Hours:</label>
                <input type="number" id="labor-hours" name="labor_hours" min="0">

                <label for="labor-rate">Labor Rate (per hour):</label>
                <input type="number" id="labor-rate" name="labor_rate" min="0">

                <label for="misc-fees">Miscellaneous Fees:</label>
                <input type="number" id="misc-fees" name="misc_fees" min="0">
            </div>

            <!-- Total Section -->
            <div class="section">
                <h2>Total</h2>
                <p>Total Cost: <span id="total-cost">$0.00</span></p>
            </div>

            <!-- Payment Section -->
            <div class="section">
                <h2>Payment Information</h2>
                <label for="payment-status">Payment Status:</label>
                <select id="payment-status" name="payment_status">
                    <option value="paid">Paid</option>
                    <option value="pending">Pending</option>
                    <option value="partially_paid">Partially Paid</option>
                </select>

                <label for="payment-method">Payment Method:</label>
                <select id="payment-method" name="payment_method">
                    <option value="cash">Cash</option>
                    <option value="credit">Credit Card</option>
                    <option value="bank_transfer">Bank Transfer</option>
                </select>

                <label for="payment-amount">Payment Amount:</label>
                <input type="number" id="payment-amount" name="payment_amount">
            </div>

            <!-- Generate Invoice -->
            <div class="section">
                <button type="submit">Generate Invoice</button>
            </div>
        </form>
    </div>

    <script src="scripts.js"></script>
</body>
</html>

Next Steps

Styling: We can apply styles to make this form look clean and professional.
JavaScript: Implement auto-calculation for the total cost and parts section.
Back-End: Set up a back-end to handle the form submission, store invoice details in a database, and generate PDF invoices.

Let me know how you'd like to continue, and we can move forward with additional functionality or start working on the back-end!

Ah, you want the billing system to be built using Kivy (KSH could have been a typo for Kivy). Kivy is a great choice for building interactive applications, especially when it comes to building UIs with Python.

Here's how we can start building the front end of the garage billing system using Kivy:

Steps to Build a Garage Billing System in Kivy

Install Kivy: If you haven’t installed Kivy yet, you can install it with:
```
bash
pip install kivy
```
Structure: We will create a simple form where users can enter customer information, service details, parts used, additional fees, and payment information.
Basic UI Components:
- Text Inputs: For customer details, vehicle information, cost, etc.
- Buttons: To add parts, calculate totals, and generate invoices.
- Labels: To display calculated totals.

Here’s a basic Kivy app for the billing system:

Garage Billing Kivy UI (Python Code)

python
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.dropdown import DropDown
from kivy.uix.spinner import Spinner
from kivy.uix.popup import Popup
from kivy.uix.gridlayout import GridLayout


class GarageBillingApp(App):
    def build(self):
        self.total_cost = 0

        # Main layout
        layout = BoxLayout(orientation='vertical', padding=10, spacing=10)

        # Customer Information Section
        layout.add_widget(Label(text="Customer Information"))
        self.customer_name = TextInput(hint_text="Enter Customer Name", multiline=False)
        layout.add_widget(self.customer_name)
        self.contact_info = TextInput(hint_text="Enter Contact Info", multiline=False)
        layout.add_widget(self.contact_info)
        
        # Vehicle Information Section
        layout.add_widget(Label(text="Vehicle Information"))
        self.vehicle_make = TextInput(hint_text="Enter Vehicle Make", multiline=False)
        layout.add_widget(self.vehicle_make)
        self.vehicle_model = TextInput(hint_text="Enter Vehicle Model", multiline=False)
        layout.add_widget(self.vehicle_model)
        self.license_plate = TextInput(hint_text="Enter License Plate", multiline=False)
        layout.add_widget(self.license_plate)

        # Service Provided Section
        layout.add_widget(Label(text="Services Provided"))
        self.service_dropdown = Spinner(
            text="Select Service",
            values=("Oil Change", "Tire Replacement", "Brake Repair", "Custom Service"),
            size_hint=(None, None),
            size=(200, 44)
        )
        layout.add_widget(self.service_dropdown)
        self.service_cost = TextInput(hint_text="Enter Service Cost", multiline=False)
        layout.add_widget(self.service_cost)

        # Parts Used Section
        layout.add_widget(Label(text="Parts Used"))
        self.parts_dropdown = Spinner(
            text="Select Part",
            values=("Filter", "Brakes", "Tires", "Battery", "Custom Part"),
            size_hint=(None, None),
            size=(200, 44)
        )
        layout.add_widget(self.parts_dropdown)
        self.part_quantity = TextInput(hint_text="Enter Quantity", multiline=False)
        layout.add_widget(self.part_quantity)
        self.part_cost = TextInput(hint_text="Enter Part Cost", multiline=False)
        layout.add_widget(self.part_cost)

        # Additional Fees Section
        layout.add_widget(Label(text="Additional Fees"))
        self.labor_hours = TextInput(hint_text="Enter Labor Hours", multiline=False)
        layout.add_widget(self.labor_hours)
        self.labor_rate = TextInput(hint_text="Enter Labor Rate", multiline=False)
        layout.add_widget(self.labor_rate)
        self.miscellaneous_fees = TextInput(hint_text="Enter Misc Fees", multiline=False)
        layout.add_widget(self.miscellaneous_fees)

        # Total Section
        layout.add_widget(Label(text="Total Cost"))
        self.total_label = Label(text="Total: $0.00")
        layout.add_widget(self.total_label)

        # Payment Information Section
        layout.add_widget(Label(text="Payment Information"))
        self.payment_method = Spinner(
            text="Select Payment Method",
            values=("Cash", "Credit", "Bank Transfer"),
            size_hint=(None, None),
            size=(200, 44)
        )
        layout.add_widget(self.payment_method)
        self.payment_amount = TextInput(hint_text="Enter Payment Amount", multiline=False)
        layout.add_widget(self.payment_amount)

        # Calculate Total Button
        calculate_button = Button(text="Calculate Total", size_hint=(None, None), size=(200, 50))
        calculate_button.bind(on_press=self.calculate_total)
        layout.add_widget(calculate_button)

        # Generate Invoice Button
        generate_invoice_button = Button(text="Generate Invoice", size_hint=(None, None), size=(200, 50))
        generate_invoice_button.bind(on_press=self.generate_invoice)
        layout.add_widget(generate_invoice_button)

        return layout

    def calculate_total(self, instance):
        try:
            # Fetching the inputs and performing calculations
            service_cost = float(self.service_cost.text) if self.service_cost.text else 0
            part_cost = float(self.part_cost.text) if self.part_cost.text else 0
            part_quantity = int(self.part_quantity.text) if self.part_quantity.text else 0
            labor_hours = float(self.labor_hours.text) if self.labor_hours.text else 0
            labor_rate = float(self.labor_rate.text) if self.labor_rate.text else 0
            misc_fees = float(self.miscellaneous_fees.text) if self.miscellaneous_fees.text else 0

            total_service_cost = service_cost
            total_part_cost = part_cost * part_quantity
            total_labor_cost = labor_hours * labor_rate

            self.total_cost = total_service_cost + total_part_cost + total_labor_cost + misc_fees

            # Update the total cost label
            self.total_label.text = f"Total: ${self.total_cost:.2f}"
        except ValueError:
            # Handle invalid input
            self.show_error_popup("Invalid input! Please make sure all values are numbers.")

    def generate_invoice(self, instance):
        # In a real-world scenario, generate and store the invoice here
        invoice_text = f"""
        Customer: {self.customer_name.text}
        Vehicle: {self.vehicle_make.text} {self.vehicle_model.text}
        License Plate: {self.license_plate.text}
        
        Service: {self.service_dropdown.text}
        Service Cost: ${self.service_cost.text}
        
        Parts: {self.parts_dropdown.text}
        Quantity: {self.part_quantity.text}
        Part Cost: ${self.part_cost.text}
        
        Labor Hours: {self.labor_hours.text}
        Labor Rate: ${self.labor_rate.text}
        
        Miscellaneous Fees: ${self.miscellaneous_fees.text}
        
        Total Cost: ${self.total_cost:.2f}
        Payment Method: {self.payment_method.text}
        Amount Paid: ${self.payment_amount.text}
        """
        self.show_invoice_popup(invoice_text)

    def show_invoice_popup(self, invoice_text):
        # Popup to display the generated invoice
        popup = Popup(title="Invoice Generated", content=Label(text=invoice_text), size_hint=(None, None), size=(400, 400))
        popup.open()

    def show_error_popup(self, error_message):
        # Popup to display error messages
        popup = Popup(title="Error", content=Label(text=error_message), size_hint=(None, None), size=(400, 200))
        popup.open()


if __name__ == "__main__":
    GarageBillingApp().run()

Explanation of the Code:

Customer and Vehicle Information: Users can input customer and vehicle details.
Services and Parts: Dropdown menus for selecting services and parts, with fields for cost and quantity.
Additional Fees: Input fields for labor hours, rate, and miscellaneous fees.
Total Calculation: The calculate_total function handles the logic for calculating the total cost based on the input.
Invoice Generation: The generate_invoice function prepares a formatted invoice as a string and displays it in a popup.

To Run the App:

Save the code to a file (e.g., garage_billing.py).
Run it using the command:
```
bash
python garage_billing.py
```

This basic app allows the user to input all the necessary information, calculate the total cost, and generate an invoice.

Let me know if you want to add more features or improve the layout!

Got it! If you want to display the currency as Kenyan Shillings (KSH), we can adjust the code to reflect this in the calculations and labels.

Here’s how we can modify the Kivy app to show the total in KSH:

Key Changes:

Update the total cost labels to show "KSH" instead of "$".
Adjust the currency symbol in places where the price is displayed.

Updated Code Snippet (with KSH currency):

python
class GarageBillingApp(App):
    def build(self):
        self.total_cost = 0

        # Main layout
        layout = BoxLayout(orientation='vertical', padding=10, spacing=10)

        # Customer Information Section
        layout.add_widget(Label(text="Customer Information"))
        self.customer_name = TextInput(hint_text="Enter Customer Name", multiline=False)
        layout.add_widget(self.customer_name)
        self.contact_info = TextInput(hint_text="Enter Contact Info", multiline=False)
        layout.add_widget(self.contact_info)
        
        # Vehicle Information Section
        layout.add_widget(Label(text="Vehicle Information"))
        self.vehicle_make = TextInput(hint_text="Enter Vehicle Make", multiline=False)
        layout.add_widget(self.vehicle_make)
        self.vehicle_model = TextInput(hint_text="Enter Vehicle Model", multiline=False)
        layout.add_widget(self.vehicle_model)
        self.license_plate = TextInput(hint_text="Enter License Plate", multiline=False)
        layout.add_widget(self.license_plate)

        # Service Provided Section
        layout.add_widget(Label(text="Services Provided"))
        self.service_dropdown = Spinner(
            text="Select Service",
            values=("Oil Change", "Tire Replacement", "Brake Repair", "Custom Service"),
            size_hint=(None, None),
            size=(200, 44)
        )
        layout.add_widget(self.service_dropdown)
        self.service_cost = TextInput(hint_text="Enter Service Cost", multiline=False)
        layout.add_widget(self.service_cost)

        # Parts Used Section
        layout.add_widget(Label(text="Parts Used"))
        self.parts_dropdown = Spinner(
            text="Select Part",
            values=("Filter", "Brakes", "Tires", "Battery", "Custom Part"),
            size_hint=(None, None),
            size=(200, 44)
        )
        layout.add_widget(self.parts_dropdown)
        self.part_quantity = TextInput(hint_text="Enter Quantity", multiline=False)
        layout.add_widget(self.part_quantity)
        self.part_cost = TextInput(hint_text="Enter Part Cost", multiline=False)
        layout.add_widget(self.part_cost)

        # Additional Fees Section
        layout.add_widget(Label(text="Additional Fees"))
        self.labor_hours = TextInput(hint_text="Enter Labor Hours", multiline=False)
        layout.add_widget(self.labor_hours)
        self.labor_rate = TextInput(hint_text="Enter Labor Rate", multiline=False)
        layout.add_widget(self.labor_rate)
        self.miscellaneous_fees = TextInput(hint_text="Enter Misc Fees", multiline=False)
        layout.add_widget(self.miscellaneous_fees)

        # Total Section
        layout.add_widget(Label(text="Total Cost"))
        self.total_label = Label(text="Total: KSH 0.00")
        layout.add_widget(self.total_label)

        # Payment Information Section
        layout.add_widget(Label(text="Payment Information"))
        self.payment_method = Spinner(
            text="Select Payment Method",
            values=("Cash", "Credit", "Bank Transfer"),
            size_hint=(None, None),
            size=(200, 44)
        )
        layout.add_widget(self.payment_method)
        self.payment_amount = TextInput(hint_text="Enter Payment Amount", multiline=False)
        layout.add_widget(self.payment_amount)

        # Calculate Total Button
        calculate_button = Button(text="Calculate Total", size_hint=(None, None), size=(200, 50))
        calculate_button.bind(on_press=self.calculate_total)
        layout.add_widget(calculate_button)

        # Generate Invoice Button
        generate_invoice_button = Button(text="Generate Invoice", size_hint=(None, None), size=(200, 50))
        generate_invoice_button.bind(on_press=self.generate_invoice)
        layout.add_widget(generate_invoice_button)

        return layout

    def calculate_total(self, instance):
        try:
            # Fetching the inputs and performing calculations
            service_cost = float(self.service_cost.text) if self.service_cost.text else 0
            part_cost = float(self.part_cost.text) if self.part_cost.text else 0
            part_quantity = int(self.part_quantity.text) if self.part_quantity.text else 0
            labor_hours = float(self.labor_hours.text) if self.labor_hours.text else 0
            labor_rate = float(self.labor_rate.text) if self.labor_rate.text else 0
            misc_fees = float(self.miscellaneous_fees.text) if self.miscellaneous_fees.text else 0

            total_service_cost = service_cost
            total_part_cost = part_cost * part_quantity
            total_labor_cost = labor_hours * labor_rate

            self.total_cost = total_service_cost + total_part_cost + total_labor_cost + misc_fees

            # Update the total cost label with KSH currency
            self.total_label.text = f"Total: KSH {self.total_cost:.2f}"
        except ValueError:
            # Handle invalid input
            self.show_error_popup("Invalid input! Please make sure all values are numbers.")

    def generate_invoice(self, instance):
        # In a real-world scenario, generate and store the invoice here
        invoice_text = f"""
        Customer: {self.customer_name.text}
        Vehicle: {self.vehicle_make.text} {self.vehicle_model.text}
        License Plate: {self.license_plate.text}
        
        Service: {self.service_dropdown.text}
        Service Cost: KSH {self.service_cost.text}
        
        Parts: {self.parts_dropdown.text}
        Quantity: {self.part_quantity.text}
        Part Cost: KSH {self.part_cost.text}
        
        Labor Hours: {self.labor_hours.text}
        Labor Rate: KSH {self.labor_rate.text}
        
        Miscellaneous Fees: KSH {self.miscellaneous_fees.text}
        
        Total Cost: KSH {self.total_cost:.2f}
        Payment Method: {self.payment_method.text}
        Amount Paid: KSH {self.payment_amount.text}
        """
        self.show_invoice_popup(invoice_text)

    def show_invoice_popup(self, invoice_text):
        # Popup to display the generated invoice
        popup = Popup(title="Invoice Generated", content=Label(text=invoice_text), size_hint=(None, None), size=(400, 400))
        popup.open()

    def show_error_popup(self, error_message):
        # Popup to display error messages
        popup = Popup(title="Error", content=Label(text=error_message), size_hint=(None, None), size=(400, 200))
        popup.open()


if __name__ == "__main__":
    GarageBillingApp().run()

What’s Changed:

Currency Symbol: We updated the total cost and parts cost to display in KSH.
Invoice Formatting: The generated invoice now displays the costs in Kenyan Shillings (KSH).

Example Output:

Total Cost: KSH 2500.00
Service Cost: KSH 1000.00
Parts Cost: KSH 500.00
Miscellaneous Fees: KSH 200.00

Let me know if you need any further adjustments or improvements!

To start the garage billing system from scratch with the front-end views, we'll structure the application to create a clean and clear user interface for the billing process. I'll guide you through creating the views first, and then we can add the functionality step by step.

Let's break the process into manageable steps:

Garage Billing System UI Structure

Customer Information Section:
- Fields to enter customer name and contact details.
Vehicle Information Section:
- Fields to input vehicle make, model, and license plate.
Service Information Section:
- Dropdown for selecting the type of service (e.g., oil change, tire replacement, etc.).
- Input field for service cost.
Parts and Additional Costs Section:
- Dropdown for selecting parts (e.g., tires, filters, etc.).
- Input fields for quantity and cost per part.
- Input fields for additional labor or miscellaneous fees.
Total Calculation Section:
- A label that dynamically displays the total cost.
Payment Section:
- Dropdown for selecting the payment method (Cash, Credit, Bank Transfer).
- Input for entering the payment amount.
Generate Invoice Section:
- A button that generates the invoice.

Kivy App UI Code for Front-End Views

python
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.spinner import Spinner
from kivy.uix.popup import Popup
from kivy.uix.gridlayout import GridLayout

class GarageBillingApp(App):
    def build(self):
        self.total_cost = 0

        # Main layout with vertical orientation
        layout = BoxLayout(orientation='vertical', padding=10, spacing=10)

        # --- Customer Information Section ---
        customer_layout = BoxLayout(orientation='vertical')
        customer_layout.add_widget(Label(text="Customer Information"))
        self.customer_name = TextInput(hint_text="Enter Customer Name", multiline=False)
        customer_layout.add_widget(self.customer_name)
        self.contact_info = TextInput(hint_text="Enter Contact Info", multiline=False)
        customer_layout.add_widget(self.contact_info)
        layout.add_widget(customer_layout)

        # --- Vehicle Information Section ---
        vehicle_layout = BoxLayout(orientation='vertical')
        vehicle_layout.add_widget(Label(text="Vehicle Information"))
        self.vehicle_make = TextInput(hint_text="Enter Vehicle Make", multiline=False)
        vehicle_layout.add_widget(self.vehicle_make)
        self.vehicle_model = TextInput(hint_text="Enter Vehicle Model", multiline=False)
        vehicle_layout.add_widget(self.vehicle_model)
        self.license_plate = TextInput(hint_text="Enter License Plate", multiline=False)
        vehicle_layout.add_widget(self.license_plate)
        layout.add_widget(vehicle_layout)

        # --- Service Information Section ---
        service_layout = BoxLayout(orientation='vertical')
        service_layout.add_widget(Label(text="Service Information"))
        self.service_dropdown = Spinner(
            text="Select Service",
            values=("Oil Change", "Tire Replacement", "Brake Repair", "Custom Service"),
            size_hint=(None, None),
            size=(200, 44)
        )
        service_layout.add_widget(self.service_dropdown)
        self.service_cost = TextInput(hint_text="Enter Service Cost (KSH)", multiline=False)
        service_layout.add_widget(self.service_cost)
        layout.add_widget(service_layout)

        # --- Parts and Additional Costs Section ---
        parts_layout = BoxLayout(orientation='vertical')
        parts_layout.add_widget(Label(text="Parts & Additional Costs"))
        self.parts_dropdown = Spinner(
            text="Select Part",
            values=("Filter", "Brakes", "Tires", "Battery", "Custom Part"),
            size_hint=(None, None),
            size=(200, 44)
        )
        parts_layout.add_widget(self.parts_dropdown)
        self.part_quantity = TextInput(hint_text="Enter Quantity", multiline=False)
        parts_layout.add_widget(self.part_quantity)
        self.part_cost = TextInput(hint_text="Enter Part Cost (KSH)", multiline=False)
        parts_layout.add_widget(self.part_cost)
        self.labor_hours = TextInput(hint_text="Enter Labor Hours", multiline=False)
        parts_layout.add_widget(self.labor_hours)
        self.labor_rate = TextInput(hint_text="Enter Labor Rate (KSH)", multiline=False)
        parts_layout.add_widget(self.labor_rate)
        self.miscellaneous_fees = TextInput(hint_text="Enter Miscellaneous Fees (KSH)", multiline=False)
        parts_layout.add_widget(self.miscellaneous_fees)
        layout.add_widget(parts_layout)

        # --- Total Calculation Section ---
        total_layout = BoxLayout(orientation='horizontal')
        total_layout.add_widget(Label(text="Total Cost:"))
        self.total_label = Label(text="KSH 0.00")
        total_layout.add_widget(self.total_label)
        layout.add_widget(total_layout)

        # --- Payment Information Section ---
        payment_layout = BoxLayout(orientation='vertical')
        payment_layout.add_widget(Label(text="Payment Information"))
        self.payment_method = Spinner(
            text="Select Payment Method",
            values=("Cash", "Credit", "Bank Transfer"),
            size_hint=(None, None),
            size=(200, 44)
        )
        payment_layout.add_widget(self.payment_method)
        self.payment_amount = TextInput(hint_text="Enter Payment Amount (KSH)", multiline=False)
        payment_layout.add_widget(self.payment_amount)
        layout.add_widget(payment_layout)

        # --- Buttons ---
        button_layout = BoxLayout(orientation='horizontal', size_hint=(None, None), size=(200, 50))
        calculate_button = Button(text="Calculate Total")
        calculate_button.bind(on_press=self.calculate_total)
        button_layout.add_widget(calculate_button)

        generate_invoice_button = Button(text="Generate Invoice")
        generate_invoice_button.bind(on_press=self.generate_invoice)
        button_layout.add_widget(generate_invoice_button)

        layout.add_widget(button_layout)

        return layout

    def calculate_total(self, instance):
        try:
            # Calculate total cost based on input
            service_cost = float(self.service_cost.text) if self.service_cost.text else 0
            part_cost = float(self.part_cost.text) if self.part_cost.text else 0
            part_quantity = int(self.part_quantity.text) if self.part_quantity.text else 0
            labor_hours = float(self.labor_hours.text) if self.labor_hours.text else 0
            labor_rate = float(self.labor_rate.text) if self.labor_rate.text else 0
            misc_fees = float(self.miscellaneous_fees.text) if self.miscellaneous_fees.text else 0

            total_service_cost = service_cost
            total_part_cost = part_cost * part_quantity
            total_labor_cost = labor_hours * labor_rate

            self.total_cost = total_service_cost + total_part_cost + total_labor_cost + misc_fees

            # Update the total cost label
            self.total_label.text = f"KSH {self.total_cost:.2f}"
        except ValueError:
            # Show error if inputs are not valid
            self.show_error_popup("Invalid input! Please make sure all values are numbers.")

    def generate_invoice(self, instance):
        # Generate the invoice text
        invoice_text = f"""
        Customer: {self.customer_name.text}
        Vehicle: {self.vehicle_make.text} {self.vehicle_model.text}
        License Plate: {self.license_plate.text}
        
        Service: {self.service_dropdown.text}
        Service Cost: KSH {self.service_cost.text}
        
        Parts: {self.parts_dropdown.text}
        Quantity: {self.part_quantity.text}
        Part Cost: KSH {self.part_cost.text}
        
        Labor Hours: {self.labor_hours.text}
        Labor Rate: KSH {self.labor_rate.text}
        
        Miscellaneous Fees: KSH {self.miscellaneous_fees.text}
        
        Total Cost: KSH {self.total_cost:.2f}
        Payment Method: {self.payment_method.text}
        Amount Paid: KSH {self.payment_amount.text}
        """
        self.show_invoice_popup(invoice_text)

    def show_invoice_popup(self, invoice_text):
        # Display invoice in a popup window
        popup = Popup(title="Invoice Generated", content=Label(text=invoice_text), size_hint=(None, None), size=(400, 400))
        popup.open()

    def show_error_popup(self, error_message):
        # Show error messages in a popup
        popup = Popup(title="Error", content=Label(text=error_message), size_hint=(None, None), size=(400, 200))
        popup.open()

if __name__ == "__main__":
    GarageBillingApp().run()

Explanation of the UI Components:

Customer Information: Inputs for the customer’s name and contact details.
Vehicle Information: Inputs for vehicle make, model, and license plate.
Service Information: Dropdown for selecting a service (oil change, brake repair, etc.) and an input for entering the service cost.
Parts and Additional Costs: Inputs for parts (quantity and cost) and additional costs like labor hours and miscellaneous fees.
Total Cost: A dynamic label that updates the total cost based on user input.
Payment Information: Dropdown for selecting payment methods and an input for the payment amount.
Buttons:
- Calculate Total: Calculates the total amount for the services and parts.
- Generate Invoice: Displays the generated invoice in a popup.

Next Steps:

You can now run this app, and the front-end will display forms for the customer to input their details.
The "Calculate Total" button will compute the total and update the display in Kenyan Shillings (KSH).
The "Generate Invoice" button will show a pop-up with the detailed invoice.

Let me know how it goes or if you need further help!

Got it! Let's start fresh with Python and Django for the garage billing system.

Step-by-Step Guide

We'll begin by setting up the Django views and templates for the front-end. The main components of the garage billing system will be:

Customer Information
Vehicle Information
Service Information
Parts and Additional Costs
Total Calculation
Payment Information
Generate Invoice

Let's create the models, views, and templates to manage these sections.

1. Setting Up Django Models

First, let's define the models for customer, vehicle, services, and other related information.

models.py:

python
from django.db import models

class Customer(models.Model):
    name = models.CharField(max_length=255)
    contact_info = models.CharField(max_length=255)

    def __str__(self):
        return self.name


class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, related_name="vehicles", on_delete=models.CASCADE)
    make = models.CharField(max_length=255)
    model = models.CharField(max_length=255)
    license_plate = models.CharField(max_length=255)

    def __str__(self):
        return f"{self.make} {self.model} ({self.license_plate})"


class Service(models.Model):
    name = models.CharField(max_length=255)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return self.name


class Part(models.Model):
    name = models.CharField(max_length=255)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return self.name


class Billing(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    part = models.ForeignKey(Part, on_delete=models.CASCADE)
    part_quantity = models.PositiveIntegerField(default=1)
    labor_hours = models.PositiveIntegerField(default=0)
    labor_rate = models.DecimalField(max_digits=10, decimal_places=2, default=0.0)
    miscellaneous_fees = models.DecimalField(max_digits=10, decimal_places=2, default=0.0)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, default=0.0)
    payment_method = models.CharField(max_length=255)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

    def calculate_total(self):
        service_cost = self.service.cost
        part_cost = self.part.cost * self.part_quantity
        labor_cost = self.labor_hours * self.labor_rate
        total = service_cost + part_cost + labor_cost + self.miscellaneous_fees
        self.total_cost = total
        self.save()
        return total

    def __str__(self):
        return f"Billing for {self.customer.name} - {self.vehicle.make} {self.vehicle.model}"

2. Creating Django Forms

Now, let’s create forms to handle the data input from the user.

forms.py:

python
from django import forms
from .models import Customer, Vehicle, Service, Part, Billing

class CustomerForm(forms.ModelForm):
    class Meta:
        model = Customer
        fields = ['name', 'contact_info']


class VehicleForm(forms.ModelForm):
    class Meta:
        model = Vehicle
        fields = ['make', 'model', 'license_plate']


class BillingForm(forms.ModelForm):
    class Meta:
        model = Billing
        fields = [
            'customer', 'vehicle', 'service', 'part', 'part_quantity', 
            'labor_hours', 'labor_rate', 'miscellaneous_fees', 
            'payment_method', 'payment_amount'
        ]

3. Creating Views

Now, let's create views that will handle rendering the forms and calculating the total.

views.py:

python
from django.shortcuts import render, redirect
from .models import Customer, Vehicle, Service, Part, Billing
from .forms import CustomerForm, VehicleForm, BillingForm

def create_customer(request):
    if request.method == 'POST':
        form = CustomerForm(request.POST)
        if form.is_valid():
            customer = form.save()
            return redirect('create_vehicle', customer_id=customer.id)
    else:
        form = CustomerForm()
    return render(request, 'garage/create_customer.html', {'form': form})

def create_vehicle(request, customer_id):
    customer = Customer.objects.get(id=customer_id)
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer
            vehicle.save()
            return redirect('create_billing', vehicle_id=vehicle.id)
    else:
        form = VehicleForm()
    return render(request, 'garage/create_vehicle.html', {'form': form, 'customer': customer})

def create_billing(request, vehicle_id):
    vehicle = Vehicle.objects.get(id=vehicle_id)
    services = Service.objects.all()
    parts = Part.objects.all()
    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle
            billing.calculate_total()  # Calculate the total cost here
            billing.save()
            return redirect('generate_invoice', billing_id=billing.id)
    else:
        form = BillingForm()
    return render(request, 'garage/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

def generate_invoice(request, billing_id):
    billing = Billing.objects.get(id=billing_id)
    return render(request, 'garage/invoice.html', {'billing': billing})

4. Creating Templates

Now let's create the templates for each step of the process.

create_customer.html:

html
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Next</button>
</form>

create_vehicle.html:

html
<h1>Vehicle Information for {{ customer.name }}</h1>
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Next</button>
</form>

create_billing.html:

html
<h1>Billing Information for {{ vehicle.make }} {{ vehicle.model }}</h1>
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <label for="service">Select Service:</label>
    <select name="service">
        {% for service in services %}
            <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
        {% endfor %}
    </select>
    <label for="part">Select Part:</label>
    <select name="part">
        {% for part in parts %}
            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
        {% endfor %}
    </select>
    <button type="submit">Calculate Total</button>
</form>

invoice.html:

html
<h1>Invoice</h1>
<p>Customer: {{ billing.customer.name }}</p>
<p>Vehicle: {{ billing.vehicle.make }} {{ billing.vehicle.model }}</p>
<p>Service: {{ billing.service.name }} - KSH {{ billing.service.cost }}</p>
<p>Part: {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p>
<p>Total Cost: KSH {{ billing.total_cost }}</p>
<p>Payment Method: {{ billing.payment_method }}</p>
<p>Amount Paid: KSH {{ billing.payment_amount }}</p>

5. URLs Configuration

Finally, we need to add the necessary URL patterns for these views.

urls.py:

python
from django.urls import path
from . import views

urlpatterns = [
    path('create_customer/', views.create_customer, name='create_customer'),
    path('create_vehicle/<int:customer_id>/', views.create_vehicle, name='create_vehicle'),
    path('create_billing/<int:vehicle_id>/', views.create_billing, name='create_billing'),
    path('generate_invoice/<int:billing_id>/', views.generate_invoice, name='generate_invoice'),
]

Conclusion

We've created models, views, forms, and templates to handle the garage billing system.
The user flow allows creating a customer, adding their vehicle, adding billing details, and generating an invoice.
The total cost is automatically calculated when the user submits the billing form.

Let me know if you'd like to add more features or improve any part of the system!

Great! Let's start with a home page template for the garage billing system.

We will create a simple landing page where users can choose the action they want to take (such as creating a customer, vehicle, billing, or viewing invoices).

Here's an enhanced version of home.html to provide links to various parts of the system, allowing the user to navigate through:

home.html:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Billing System</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f4f4f9;
        }
        header {
            background-color: #4CAF50;
            color: white;
            padding: 15px 0;
            text-align: center;
        }
        h1 {
            margin: 0;
        }
        .container {
            padding: 20px;
            text-align: center;
        }
        .btn {
            display: inline-block;
            padding: 12px 25px;
            margin: 10px;
            background-color: #4CAF50;
            color: white;
            text-decoration: none;
            border-radius: 5px;
            font-size: 16px;
        }
        .btn:hover {
            background-color: #45a049;
        }
        footer {
            background-color: #333;
            color: white;
            text-align: center;
            padding: 10px;
            position: fixed;
            width: 100%;
            bottom: 0;
        }
    </style>
</head>
<body>
    <header>
        <h1>Garage Billing System</h1>
        <p>Manage invoices, payments, and transactions.</p>
    </header>

    <div class="container">
        <h2>Welcome to the Garage Billing System!</h2>
        <p>Choose an action below to get started:</p>

        <div>
            <a href="{% url 'create_customer' %}" class="btn">Create Customer</a>
            <a href="{% url 'create_vehicle' 0 %}" class="btn">Add Vehicle</a>
            <a href="{% url 'create_billing' 0 %}" class="btn">Generate Billing</a>
            <a href="{% url 'generate_invoice' 0 %}" class="btn">View Invoices</a>
        </div>
    </div>

    <footer>
        <p>&copy; 2025 Garage Billing System. All rights reserved.</p>
    </footer>
</body>
</html>

Explanation:

Header: A clean header with the title of the system and a description.
Container: A section where we provide the user with four actions:
- Create Customer: Takes the user to the customer creation page.
- Add Vehicle: Takes the user to the vehicle addition page.
- Generate Billing: Takes the user to the billing creation page.
- View Invoices: Takes the user to the page to view generated invoices.
Styling: Added some basic styling to make the page visually appealing, including a clean layout and button hover effects.
Footer: A footer that stays at the bottom of the page.

Next Steps:

Ensure that the URL routing is set up to point to the correct views for each of these actions.
Link these actions to the corresponding Django views:
- create_customer
- create_vehicle
- create_billing
- generate_invoice

Let me know if you need further assistance with any specific part of the page or the routing!

NoReverseMatch at /billing/ Reverse for 'create_customer' not found. 'create_customer' is not a valid view function or pattern name. Request Method: GET Request URL: http://127.0.0.1:8000/billing/ Django Version: 5.1.7 Exception Type: NoReverseMatch Exception Value: Reverse for 'create_customer' not found. 'create_customer' is not a valid view function or pattern name. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\urls\resolvers.py, line 831, in _reverse_with_prefix Raised during: billing.views.billing_home Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Sun, 30 Mar 2025 15:07:50 +0000

The error you're encountering (NoReverseMatch) typically means that Django cannot find a URL pattern for the create_customer view. This happens when the name used in the url tag in your template doesn't match any defined URL pattern in your urls.py.

Solution:

Ensure the View Exists in views.py:

First, make sure you have the correct view in views.py for create_customer:

python
def create_customer(request):
    if request.method == 'POST':
        form = CustomerForm(request.POST)
        if form.is_valid():
            customer = form.save()
            return redirect('create_vehicle', customer_id=customer.id)
    else:
        form = CustomerForm()
    return render(request, 'garage/create_customer.html', {'form': form})

Define the URL Pattern:

In your urls.py, you need to add the corresponding URL pattern for create_customer. Here's an example of what your urls.py should look like:

python
from django.urls import path
from . import views

urlpatterns = [
    path('', views.billing_home, name='billing_home'),
    path('create_customer/', views.create_customer, name='create_customer'),
    path('create_vehicle/<int:customer_id>/', views.create_vehicle, name='create_vehicle'),
    path('create_billing/<int:vehicle_id>/', views.create_billing, name='create_billing'),
    path('generate_invoice/<int:billing_id>/', views.generate_invoice, name='generate_invoice'),
]

Make sure you have a create_customer path in your urlpatterns.

Update Template URLs:

In your home.html, you're using {% url 'create_customer' %}. Ensure that the correct URL pattern name is being used as shown in the urls.py above ('create_customer').

Example:
```
html
<a href="{% url 'create_customer' %}" class="btn">Create Customer</a>
```
Check for Typo or Missing URL Conf:

If you're still facing issues, double-check for any typos in the names of the URL patterns or the view functions.

In Summary:

Ensure that the create_customer view exists in views.py.
Ensure the corresponding URL pattern is defined in urls.py.
Make sure your home.html template uses {% url 'create_customer' %} correctly.

After updating, restart your Django server and try accessing the page again. Let me know if you encounter any other issues!

Great! Let's proceed by defining the necessary views for the paths you've provided.

1. `create_customer` View:

This view allows the creation of a new customer.

python
from django.shortcuts import render, redirect
from .forms import CustomerForm, VehicleForm, BillingForm
from .models import Customer

def create_customer(request):
    if request.method == 'POST':
        form = CustomerForm(request.POST)
        if form.is_valid():
            customer = form.save()
            return redirect('create_vehicle', customer_id=customer.id)
    else:
        form = CustomerForm()
    return render(request, 'garage/create_customer.html', {'form': form})

2. `create_vehicle` View:

This view allows adding a vehicle for an existing customer.

python
from django.shortcuts import render, redirect
from .models import Customer, Vehicle
from .forms import VehicleForm

def create_vehicle(request, customer_id):
    customer = Customer.objects.get(id=customer_id)  # Get the customer by ID
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Link vehicle to the customer
            vehicle.save()
            return redirect('create_billing', vehicle_id=vehicle.id)
    else:
        form = VehicleForm()
    return render(request, 'garage/create_vehicle.html', {'form': form, 'customer': customer})

3. `create_billing` View:

This view allows creating a billing entry for a vehicle and calculating the total cost.

python
from django.shortcuts import render, redirect
from .models import Vehicle, Service, Part, Billing
from .forms import BillingForm

def create_billing(request, vehicle_id):
    vehicle = Vehicle.objects.get(id=vehicle_id)  # Get the vehicle by ID
    services = Service.objects.all()  # Get all available services
    parts = Part.objects.all()  # Get all available parts
    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            billing.calculate_total()  # Calculate the total cost
            billing.save()
            return redirect('generate_invoice', billing_id=billing.id)
    else:
        form = BillingForm()
    return render(request, 'garage/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

4. `generate_invoice` View:

This view generates the invoice after the billing is created.

python
from django.shortcuts import render
from .models import Billing

def generate_invoice(request, billing_id):
    billing = Billing.objects.get(id=billing_id)  # Get the billing by ID
    return render(request, 'garage/invoice.html', {'billing': billing})

Template Views Explanation:

create_customer.html: This template will display the form for creating a new customer.

html
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Save Customer</button>
</form>

create_vehicle.html: This template will display the form for adding a vehicle to an existing customer.

html
<h1>Add Vehicle for {{ customer.name }}</h1>
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Add Vehicle</button>
</form>

create_billing.html: This template will display the form to generate a billing entry and calculate the total.

html
<h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <label for="service">Select Service:</label>
    <select name="service">
        {% for service in services %}
            <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
        {% endfor %}
    </select>
    <label for="part">Select Part:</label>
    <select name="part">
        {% for part in parts %}
            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
        {% endfor %}
    </select>
    <button type="submit">Calculate Total</button>
</form>

invoice.html: This template will display the generated invoice with all details.

html
<h1>Invoice for {{ billing.customer.name }}</h1>
<p>Vehicle: {{ billing.vehicle.make }} {{ billing.vehicle.model }}</p>
<p>Service: {{ billing.service.name }} - KSH {{ billing.service.cost }}</p>
<p>Part: {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p>
<p>Total Cost: KSH {{ billing.total_cost }}</p>
<p>Payment Method: {{ billing.payment_method }}</p>
<p>Amount Paid: KSH {{ billing.payment_amount }}</p>

Next Steps:

Testing the Views: After defining the views, ensure that they work correctly by testing them in the browser. Start by visiting the home page, then proceed with creating a customer, vehicle, billing, and finally generating the invoice.

URLs: Make sure the paths are defined correctly in the urls.py:

python
urlpatterns = [
    path('', views.billing_home, name='billing_home'),
    path('create_customer/', views.create_customer, name='create_customer'),
    path('create_vehicle/<int:customer_id>/', views.create_vehicle, name='create_vehicle'),
    path('create_billing/<int:vehicle_id>/', views.create_billing, name='create_billing'),
    path('generate_invoice/<int:billing_id>/', views.generate_invoice, name='generate_invoice'),
]

After you've set everything up, test the flow from the homepage to creating customers, adding vehicles, generating bills, and finally creating invoices.

Let me know if you need further assistance or improvements!

have created the htmls in billing>temolates>billing> then the respective htmls as youve provided then the billing >views>from django.shortcuts import render def billing_home(request): return render(request, 'billing/home.html') def create_customer(request): if request.method == 'POST': form = CustomerForm(request.POST) if form.is_valid(): customer = form.save() return redirect('create_vehicle', customer_id=customer.id) else: form = CustomerForm() return render(request, 'garage/create_customer.html', {'form': form}) def create_vehicle(request, customer_id): customer = Customer.objects.get(id=customer_id) # Get the customer by ID if request.method == 'POST': form = VehicleForm(request.POST) if form.is_valid(): vehicle = form.save(commit=False) vehicle.customer = customer # Link vehicle to the customer vehicle.save() return redirect('create_billing', vehicle_id=vehicle.id) else: form = VehicleForm() return render(request, 'garage/create_vehicle.html', {'form': form, 'customer': customer}) def create_billing(request, vehicle_id): vehicle = Vehicle.objects.get(id=vehicle_id) # Get the vehicle by ID services = Service.objects.all() # Get all available services parts = Part.objects.all() # Get all available parts if request.method == 'POST': form = BillingForm(request.POST) if form.is_valid(): billing = form.save(commit=False) billing.vehicle = vehicle # Link billing to the vehicle billing.calculate_total() # Calculate the total cost billing.save() return redirect('generate_invoice', billing_id=billing.id) else: form = BillingForm() return render(request, 'garage/create_billing.html', { 'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts }) def generate_invoice(request, billing_id): billing = Billing.objects.get(id=billing_id) # Get the billing by ID return render(request, 'garage/invoice.html', {'billing': billing}) what have i ommited

It looks like your views are well set up, but there are a few things you may want to check to ensure everything is functioning correctly:

1. Forms & Models:

You seem to be using forms (e.g., CustomerForm, VehicleForm, BillingForm), but you haven’t shown the code for these forms or the models like Customer, Vehicle, Billing, etc. Ensure that the forms and models are correctly defined.

Example:

Define your models and forms in the respective files.

`models.py`:

python
from django.db import models

class Customer(models.Model):
    name = models.CharField(max_length=100)
    email = models.EmailField()
    phone = models.CharField(max_length=15)

class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    make = models.CharField(max_length=50)
    model = models.CharField(max_length=50)
    registration_number = models.CharField(max_length=20)

class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

class Part(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

class Billing(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    part = models.ForeignKey(Part, on_delete=models.CASCADE)
    part_quantity = models.IntegerField()
    total_cost = models.DecimalField(max_digits=10, decimal_places=2)
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)
    
    def calculate_total(self):
        self.total_cost = (self.service.cost + (self.part.cost * self.part_quantity))

`forms.py`:

python
from django import forms
from .models import Customer, Vehicle, Billing

class CustomerForm(forms.ModelForm):
    class Meta:
        model = Customer
        fields = ['name', 'email', 'phone']

class VehicleForm(forms.ModelForm):
    class Meta:
        model = Vehicle
        fields = ['make', 'model', 'registration_number']

class BillingForm(forms.ModelForm):
    class Meta:
        model = Billing
        fields = ['service', 'part', 'part_quantity', 'payment_method', 'payment_amount']

2. URL Mapping:

Ensure your urls.py file is correctly configured with the appropriate paths.

`urls.py`:

python
from django.urls import path
from . import views

urlpatterns = [
    path('', views.billing_home, name='billing_home'),
    path('create_customer/', views.create_customer, name='create_customer'),
    path('create_vehicle/<int:customer_id>/', views.create_vehicle, name='create_vehicle'),
    path('create_billing/<int:vehicle_id>/', views.create_billing, name='create_billing'),
    path('generate_invoice/<int:billing_id>/', views.generate_invoice, name='generate_invoice'),
]

3. Template Directory Structure:

Make sure your templates are placed in the right directory and follow the proper structure. Based on your previous message, it looks like your templates should be in:

arduino
billing/
    templates/
        billing/
            home.html
            create_customer.html
            create_vehicle.html
            create_billing.html
            invoice.html

4. Check for Missing Imports:

Double-check that you've imported the necessary models and forms in your views.py.

python
from .models import Customer, Vehicle, Billing, Service, Part
from .forms import CustomerForm, VehicleForm, BillingForm

5. Ensure Template Logic Matches the Views:

Check that the forms in the templates match the view expectations. For example:

In create_billing.html, ensure that the form is correctly bound to the BillingForm, and that the services and parts are passed from the view correctly.

`create_billing.html` Example:

html
<h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <label for="service">Select Service:</label>
    <select name="service">
        {% for service in services %}
            <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
        {% endfor %}
    </select>
    <label for="part">Select Part:</label>
    <select name="part">
        {% for part in parts %}
            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
        {% endfor %}
    </select>
    <button type="submit">Calculate Total</button>
</form>

6. Error Handling:

If you're getting an error, ensure to log or display detailed information to help troubleshoot, such as:

What form is not valid?
Is the customer_id, vehicle_id, or billing_id being passed correctly in the URL?

Final Checklist:

Models: Ensure all models (Customer, Vehicle, Service, Part, Billing) are defined correctly.
Forms: Ensure all forms (CustomerForm, VehicleForm, BillingForm) are defined and linked correctly to the models.
URLs: Ensure URL paths are correct and match the view functions.
Templates: Ensure the templates are correctly configured and use the correct form names, fields, and data.
Test Each Step: Test from creating a customer to viewing the invoice to ensure each step flows correctly.

Let me know if you encounter any specific errors, and I’ll assist you further!

In the views.py file, you'll need to import the necessary Django modules, forms, and models. Here's a breakdown of the required imports for your views:

Imports for `views.py`:

Django imports:
- render: To render templates.
- redirect: To redirect to other views after processing forms.
- get_object_or_404: To safely fetch an object by its ID (useful when looking up objects like Customer, Vehicle, etc.).
Forms:
- Import the forms you created for handling data entry (e.g., CustomerForm, VehicleForm, BillingForm).
Models:
- Import the models for your application that represent the data you're interacting with (e.g., Customer, Vehicle, Billing, Service, Part).

Complete List of Necessary Imports:

python
from django.shortcuts import render, redirect, get_object_or_404
from .models import Customer, Vehicle, Billing, Service, Part
from .forms import CustomerForm, VehicleForm, BillingForm

Explanation:

render: Renders the HTML template with the context data.
redirect: Redirects the user to another view after a successful form submission (e.g., after creating a customer, you redirect to the create_vehicle view).
get_object_or_404: Safely fetches an object by its ID, or raises a 404 error if not found (this is useful for fetching specific customers, vehicles, etc.).
Forms (CustomerForm, VehicleForm, BillingForm): These handle the input validation and rendering for the HTML form.
Models (Customer, Vehicle, Billing, Service, Part): These represent the entities in your application that you're working with (e.g., creating a customer, vehicle, or billing entry).

Example of the imports in `views.py`:

python
from django.shortcuts import render, redirect, get_object_or_404
from .models import Customer, Vehicle, Billing, Service, Part
from .forms import CustomerForm, VehicleForm, BillingForm

def billing_home(request):
    return render(request, 'billing/home.html')

def create_customer(request):
    if request.method == 'POST':
        form = CustomerForm(request.POST)
        if form.is_valid():
            customer = form.save()
            return redirect('create_vehicle', customer_id=customer.id)
    else:
        form = CustomerForm()
    return render(request, 'garage/create_customer.html', {'form': form})

def create_vehicle(request, customer_id):
    customer = get_object_or_404(Customer, id=customer_id)  # Use get_object_or_404 for safe lookup
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Link vehicle to the customer
            vehicle.save()
            return redirect('create_billing', vehicle_id=vehicle.id)
    else:
        form = VehicleForm()
    return render(request, 'garage/create_vehicle.html', {'form': form, 'customer': customer})

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Safe vehicle lookup
    services = Service.objects.all()  # Get all available services
    parts = Part.objects.all()  # Get all available parts
    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            billing.calculate_total()  # Calculate the total cost
            billing.save()
            return redirect('generate_invoice', billing_id=billing.id)
    else:
        form = BillingForm()
    return render(request, 'garage/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)  # Safe billing lookup
    return render(request, 'garage/invoice.html', {'billing': billing})

Why `get_object_or_404` is Useful:

It's a safer alternative to Vehicle.objects.get(id=vehicle_id). If the object with the given id doesn't exist, it will raise a 404 error automatically, which is good for error handling.

Final Setup:

Ensure that your models and forms are correctly defined in models.py and forms.py.
Ensure that urls.py is correctly mapping the views and that the template structure is correct.

Let me know if you need further assistance!

You're right to question that! In the views you shared, you seem to be using the garage/ path in the template names, but based on your earlier code for home.html, it looks like your templates are inside a billing/ folder.

The reason you're seeing garage/ in the template paths is likely because of the naming convention or the structure you're following. You should be consistent in the template path you use for rendering the pages.

Correcting the Template Paths

Assuming you want to keep everything in the billing/ folder inside templates, your templates should be:

billing/templates/billing/home.html
billing/templates/billing/create_customer.html
billing/templates/billing/create_vehicle.html
billing/templates/billing/create_billing.html
billing/templates/billing/invoice.html

Therefore, in your views, the correct paths for the render function should be:

python
def create_customer(request):
    if request.method == 'POST':
        form = CustomerForm(request.POST)
        if form.is_valid():
            customer = form.save()
            return redirect('create_vehicle', customer_id=customer.id)
    else:
        form = CustomerForm()
    return render(request, 'billing/create_customer.html', {'form': form})

def create_vehicle(request, customer_id):
    customer = get_object_or_404(Customer, id=customer_id)  # Safe lookup
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Link vehicle to the customer
            vehicle.save()
            return redirect('create_billing', vehicle_id=vehicle.id)
    else:
        form = VehicleForm()
    return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer})

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Safe vehicle lookup
    services = Service.objects.all()  # Get all available services
    parts = Part.objects.all()  # Get all available parts
    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            billing.calculate_total()  # Calculate the total cost
            billing.save()
            return redirect('generate_invoice', billing_id=billing.id)
    else:
        form = BillingForm()
    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)  # Safe billing lookup
    return render(request, 'billing/invoice.html', {'billing': billing})

To Fix the Issue:

Ensure your template folder structure is as follows:

arduino
billing/
    templates/
        billing/
            home.html
            create_customer.html
            create_vehicle.html
            create_billing.html
            invoice.html

Update your views to reference billing/ (not garage/) in the render function:
```
python
return render(request, 'billing/create_customer.html', {'form': form})
```
Similarly, update other views to use the billing/ prefix in the templates.

Why this Matters:

Django uses the path specified in the render() function to find the template. If you reference garage/create_customer.html, Django will look for it in a folder called garage within your templates directory, which might not exist unless you specifically create it.

Let me know if this resolves your issue or if you need further clarification!

from django.db import models class Customer(models.Model): name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) class Vehicle(models.Model): customer = models.ForeignKey(Customer, on_delete=models.CASCADE) make = models.CharField(max_length=50) model = models.CharField(max_length=50) registration_number = models.CharField(max_length=20) class Service(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) class Part(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) class Billing(models.Model): vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE) service = models.ForeignKey(Service, on_delete=models.CASCADE) part = models.ForeignKey(Part, on_delete=models.CASCADE) part_quantity = models.IntegerField() total_cost = models.DecimalField(max_digits=10, decimal_places=2) payment_method = models.CharField(max_length=50) payment_amount = models.DecimalField(max_digits=10, decimal_places=2) def calculate_total(self): self.total_cost = (self.service.cost + (self.part.cost * self.part_quantity)) is ithis okay billing>models.py

The models you've defined for the Billing system look mostly fine, but there are a couple of improvements and recommendations I can make to ensure better flexibility and functionality:

1. Billing Model - `calculate_total`:

It’s good that you’re calculating the total_cost in a method, but it would be better to call this method before saving the instance (or directly in the save() method). This will ensure the total_cost is always updated before it's stored in the database.

Recommendation: You can override the save method in the Billing model to automatically calculate the total whenever the instance is saved.

2. Field Validation and Handling:

It's also important to ensure that the part_quantity should always be a positive integer to make sure the billing calculations are accurate.

Here’s a refined version of the Billing model with a few improvements:

Refined `Billing` Model:

python
from django.db import models

class Customer(models.Model):
    name = models.CharField(max_length=100)
    email = models.EmailField()
    phone = models.CharField(max_length=15)

class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    make = models.CharField(max_length=50)
    model = models.CharField(max_length=50)
    registration_number = models.CharField(max_length=20)

class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

class Part(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

class Billing(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    part = models.ForeignKey(Part, on_delete=models.CASCADE)
    part_quantity = models.IntegerField()
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

    def calculate_total(self):
        # Calculate total cost: service cost + (part cost * part quantity)
        return self.service.cost + (self.part.cost * self.part_quantity)

    def save(self, *args, **kwargs):
        # Ensure total_cost is calculated before saving
        if not self.total_cost:
            self.total_cost = self.calculate_total()
        super(Billing, self).save(*args, **kwargs)

Key Changes and Recommendations:

calculate_total:
- The method now returns the calculated total directly. In the save() method, we calculate and assign it to total_cost before calling super().save().
Override save():
- The save() method ensures that the total_cost field is always calculated and updated before the Billing instance is saved to the database.
Blank and Null for total_cost:
- I added blank=True, null=True to total_cost, allowing it to be optional in the form and database until it is calculated. However, after calculating, it will be filled before the instance is saved.
Validation on part_quantity:
- To ensure that part_quantity is positive, you can either add a custom validator or handle that validation when accepting form input in your forms (not shown here).

Conclusion:

This model should now work well for your system, ensuring the total_cost is automatically calculated before saving any Billing instances. Let me know if you'd like to adjust anything further or need help with form validation!

Yes, after making changes to your models.py file (such as modifying the Billing model), you should migrate the changes to update the database schema.

Steps to Migrate:

Make Migrations: This command generates migration files based on the changes you've made in the models.
```
bash
python manage.py makemigrations
```
Apply Migrations: This command applies the migration files to your database and updates the schema accordingly.
```
bash
python manage.py migrate
```

Why Migrate?

The makemigrations command generates a migration file, which is a record of the changes made to the model structure.
The migrate command then applies those changes to your actual database.

What Happens During Migration?

Django will compare the current state of your models.py file with the state of the database and apply any changes (such as adding or modifying fields) to keep the database schema in sync.

Important Note:

If you’ve already created the database and have existing data, make sure to test the migration in a development environment first to ensure nothing breaks or is lost during the process.

Let me know if you run into any issues during migration!

The warning you received is indicating that Django is trying to find a directory for static files at C:\Users\lau\Desktop\Projects\garage_system\static, but it doesn't exist. While this is just a warning and won't prevent you from migrating your models, it's a good idea to address it.

Fixing the Static Files Warning:

Create the static directory (if you plan to use static files like CSS, JavaScript, or images):
- In your project directory (garage_system), create a static folder:
```
vbnet
C:\Users\lau\Desktop\Projects\garage_system\static
```
Or Remove the STATICFILES_DIRS setting if you're not planning to use static files yet:
- In your settings.py, look for the STATICFILES_DIRS setting and either remove it or comment it out:
```
python
# STATICFILES_DIRS = [
#     BASE_DIR / "static",
# ]
```
This will prevent Django from looking for the static directory if you're not using static files yet.

About the "No changes detected" Message:

The "No changes detected" message means that Django didn’t detect any model changes to be migrated. This could happen if:

You haven't made any changes to the models since the last migration.
The changes you made to the Billing model (e.g., adding save() method or changes to total_cost) don't affect the database schema.

If you've modified your models and want to ensure everything is in sync, you can force Django to check by manually creating a migration:

bash
python manage.py makemigrations --empty yourappname

This will generate an empty migration file where you can manually specify model changes.

Once you're sure your models are updated and you're ready to proceed, you can run:

bash
python manage.py migrate

Let me know if you need further assistance!

from django.db import models class Customer(models.Model): name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) class Vehicle(models.Model): customer = models.ForeignKey(Customer, on_delete=models.CASCADE) make = models.CharField(max_length=50) model = models.CharField(max_length=50) registration_number = models.CharField(max_length=20) class Service(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) class Part(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) class Billing(models.Model): vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE) service = models.ForeignKey(Service, on_delete=models.CASCADE) part = models.ForeignKey(Part, on_delete=models.CASCADE) part_quantity = models.IntegerField() total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True) payment_method = models.CharField(max_length=50) payment_amount = models.DecimalField(max_digits=10, decimal_places=2) def calculate_total(self): # Calculate total cost: service cost + (part cost * part quantity) return self.service.cost + (self.part.cost * self.part_quantity) def save(self, *args, **kwargs): # Ensure total_cost is calculated before saving if not self.total_cost: self.total_cost = self.calculate_total() super(Billing, self).save(*args, **kwargs) models in billing how do i migrate

To migrate the changes you've made to your models, follow these steps:

1. Make Migrations:

After modifying the models.py file, Django needs to generate migration files that describe the changes to your database schema. This can be done with the following command:

bash
python manage.py makemigrations

This command will check for any changes in your models and generate a migration file that will be used to update the database schema.

If you have made changes in your Billing model or any other models, Django will create a new migration file for those changes.

2. Check the Migration Files:

After running makemigrations, Django will create a new migration file under the migrations/ directory in your app (e.g., billing/migrations/). You can check that file to ensure it has the expected changes.

The migration file will look something like:


migrations/0002_auto_20250330_1545.py

3. Apply the Migrations:

Once you've generated the migration file, you need to apply it to your database. This will update the database schema to reflect the changes in your models.

Run the following command to apply the migrations:

bash
python manage.py migrate

This will apply all pending migrations and update your database.

4. Verify the Changes:

After running the migrations, check your database to ensure the new fields, models, or changes are applied correctly. You can do this using the Django admin interface, by querying the database directly, or using Django's shell:

bash
python manage.py shell

Then you can check if the Billing model, for instance, is updated by running:

python
from billing.models import Billing
print(Billing.objects.all())

Notes:

If you haven't made any changes to your models, Django will show "No changes detected" when running makemigrations.
If you made changes that affect the database schema (like adding new fields), Django will create a migration file and then apply those changes when you run migrate.

Let me know if you need further assistance or run into any issues!

The message No changes detected means that Django doesn't detect any new changes in your models.py file that require a migration. This could happen for several reasons:

1. Changes Already Applied:

If you have already run makemigrations and migrate previously, Django may have already applied the changes to the database. You can check the migrations/ directory to see if there are any migration files already created.

2. Check the Models:

Ensure that the changes you made to the models (like modifying the Billing model) were actually saved in the models.py file. Sometimes, uncommitted changes in the code might not be detected.

3. Force Creation of a Migration:

If you believe changes were made to the models and Django isn't detecting them, you can try forcing Django to create a migration by using the --empty flag, which will create an empty migration file that you can manually edit if needed.

bash
python manage.py makemigrations --empty billing

After this, you will see a new migration file in your billing/migrations/ directory.

4. Check if Migrations Are Pending:

Sometimes, Django might not detect changes if the migration files are already applied. You can check if there are any pending migrations using:

bash
python manage.py showmigrations

If there are any pending migrations, it will show them with a [ ] next to the migration name. If there are no migrations pending, it will show [X].

5. Delete and Regenerate Migrations (if necessary):

If for some reason the migrations aren't being detected and you want to regenerate them from scratch, you can try the following:

Delete the existing migration files (in the migrations/ folder) except for __init__.py.
Then, run makemigrations again to regenerate the migrations:
```
bash
python manage.py makemigrations
```

6. Manually Run the Migration:

If you've verified that your models are correct and migrations still aren't being detected, try manually running migrate to apply any existing migrations:

bash
python manage.py migrate

Let me know if you're still running into issues!

It seems like the migrations/ folder (which stores your migration files) might be missing or deleted, or your app might not have been created properly in the first place. Here's how you can resolve this:

1. Create the `migrations/` Directory Manually:

If the migrations/ directory doesn't exist, Django should normally create it for you when you run makemigrations, but if it's missing, you can create it manually.

Steps:

Inside your billing app directory, create a new folder called migrations.
Inside the migrations folder, create a file named __init__.py.

Your billing/ directory structure should look like this:

markdown
billing/
  ├── migrations/
  │   └── __init__.py
  ├── models.py
  ├── views.py
  ├── ...

2. Run `makemigrations` Again:

After creating the migrations/ folder and the __init__.py file, run the makemigrations command again:

bash
python manage.py makemigrations

This should create migration files for any changes detected in your models.

3. Ensure Your App Is Registered in `INSTALLED_APPS`:

Ensure that the billing app is listed in the INSTALLED_APPS section of your settings.py file. If it's not listed, Django won't detect any changes for the app.

In settings.py, make sure you have something like this:

python
INSTALLED_APPS = [
    ...
    'billing',
    ...
]

4. Try Running Migrations:

Once the migration files are created, you can apply the migrations by running:

bash
python manage.py migrate

5. Check for Any Errors:

If you still encounter issues, please check the command output or share any error messages, and I'll help you resolve them!

Let me know if this works or if you need further assistance.

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations >> System check identified some issues: WARNINGS: ?: (staticfiles.W004) The directory 'C:\Users\lau\Desktop\Projects\garage_system\static' in the STATICFILES_DIRS setting does not exist. No changes detected (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations No changes detected (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations Migrations for 'billing': billing\migrations\0001_initial.py + Create model Customer + Create model Part + Create model Service + Create model Vehicle + Create model Billing (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, sessions Running migrations: Applying billing.0001_initial... OK (venv) PS C:\Users\lau\Desktop\Projects\garage_system> should i register in admin

Yes, it's a good idea to register your models in the Django admin interface. This will allow you to manage Customer, Vehicle, Service, Part, and Billing records from the admin panel easily.

Steps to Register Models in Django Admin:

Open your billing/admin.py file. If it doesn't exist, create it.
Import the models you want to register. For example, if you want to register Customer, Vehicle, Service, Part, and Billing models:
```
python
from django.contrib import admin
from .models import Customer, Vehicle, Service, Part, Billing
```

Register the models using admin.site.register():

python
admin.site.register(Customer)
admin.site.register(Vehicle)
admin.site.register(Service)
admin.site.register(Part)
admin.site.register(Billing)

Alternatively, you can customize how the models appear in the admin interface by using ModelAdmin classes. For example:

python
@admin.register(Customer)
class CustomerAdmin(admin.ModelAdmin):
    list_display = ('name', 'email', 'phone')
    search_fields = ('name', 'email')

@admin.register(Vehicle)
class VehicleAdmin(admin.ModelAdmin):
    list_display = ('make', 'model', 'registration_number', 'customer')
    search_fields = ('make', 'model', 'registration_number')

This allows you to specify what fields are shown and how users can search for them.

Save your admin.py file.
Access the Admin Panel:
- Run the development server (if it's not already running):
```
bash
python manage.py runserver
```
- Navigate to http://127.0.0.1:8000/admin/ in your web browser.
- Log in using the admin credentials (create a superuser if you haven't already):
```
bash
python manage.py createsuperuser
```
View the models in the Admin Panel: You should now see Customer, Vehicle, Service, Part, and Billing models listed in the Django admin interface. You can add, edit, and delete records from there.

Example of `admin.py`:

python
from django.contrib import admin
from .models import Customer, Vehicle, Service, Part, Billing

@admin.register(Customer)
class CustomerAdmin(admin.ModelAdmin):
    list_display = ('name', 'email', 'phone')
    search_fields = ('name', 'email')

@admin.register(Vehicle)
class VehicleAdmin(admin.ModelAdmin):
    list_display = ('make', 'model', 'registration_number', 'customer')
    search_fields = ('make', 'model', 'registration_number')

@admin.register(Service)
class ServiceAdmin(admin.ModelAdmin):
    list_display = ('name', 'cost')
    search_fields = ('name',)

@admin.register(Part)
class PartAdmin(admin.ModelAdmin):
    list_display = ('name', 'cost')
    search_fields = ('name',)

@admin.register(Billing)
class BillingAdmin(admin.ModelAdmin):
    list_display = ('vehicle', 'service', 'part', 'part_quantity', 'total_cost', 'payment_method', 'payment_amount')
    search_fields = ('vehicle__registration_number', 'service__name', 'part__name')

Let me know if you need any more help with the admin setup!

DoesNotExist at /billing/create_vehicle/0/ Customer matching query does not exist. Request Method: GET Request URL: http://127.0.0.1:8000/billing/create_vehicle/0/ Django Version: 5.1.7 Exception Type: DoesNotExist Exception Value: Customer matching query does not exist. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py, line 649, in get Raised during: billing.views.create_vehicle Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Sun, 30 Mar 2025 15:27:41 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 20, in create_vehicle customer = Customer.objects.get(id=customer_id) # Get the customer by ID ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars Variable Value customer_id 0 request <WSGIRequest: GET '/billing/create_vehicle/0/'> def create_vehicle(request, customer_id): customer = Customer.objects.get(id=customer_id) # Get the customer by ID if request.method == 'POST': form = VehicleForm(request.POST) if form.is_valid(): vehicle = form.save(commit=False) vehicle.customer = customer # Link vehicle to the customer vehicle.save() return redirect('create_billing', vehicle_id=vehicle.id) else: form = VehicleForm() return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer})

The error Customer matching query does not exist occurs because the customer_id passed in the URL (0 in this case) doesn't correspond to a valid customer in your database. This results in Django raising a DoesNotExist exception when trying to retrieve the customer with Customer.objects.get(id=customer_id).

To resolve this, you can take the following steps:

1. Validate the Customer ID:

You should ensure that the customer_id is valid before querying the database. If the customer_id is not found, you can handle the exception gracefully and display a useful error message or redirect the user to a different page (such as the customer creation page).

2. Handle the `DoesNotExist` Exception:

Modify your create_vehicle view to catch the DoesNotExist exception and display a helpful error message.

Here's an updated version of your create_vehicle view that handles the error:

python
from django.shortcuts import render, redirect
from django.core.exceptions import ObjectDoesNotExist
from .models import Customer, Vehicle
from .forms import VehicleForm

def create_vehicle(request, customer_id):
    try:
        customer = Customer.objects.get(id=customer_id)  # Try to get the customer by ID
    except ObjectDoesNotExist:
        # If the customer does not exist, handle the error (e.g., redirect to an error page or customer list)
        return redirect('create_customer')  # You can also create a 'customer_not_found' view to handle this case

    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Link vehicle to the customer
            vehicle.save()
            return redirect('create_billing', vehicle_id=vehicle.id)
    else:
        form = VehicleForm()

    return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer})

3. Explanation:

try-except block: The try block attempts to get the Customer by ID. If the customer doesn't exist, the except block catches the DoesNotExist exception and redirects the user to the create_customer page (or another error handling view).
Redirection: You could redirect the user to a page where they can create a new customer, or you could create a specific "Customer Not Found" page for better user experience.

4. Verify the URL:

Ensure that the customer_id passed in the URL is valid. For example, check your URL pattern and ensure it's being passed correctly.

For example, the URL pattern for create_vehicle should look like this:

python
path('create_vehicle/<int:customer_id>/', create_vehicle, name='create_vehicle'),

When you navigate to this URL, make sure the customer_id is a valid ID from the database, or handle invalid customer_id values as shown above.

5. Test the View:

After making the changes, test the URL again, and ensure that the application behaves as expected. If the customer_id is invalid, it should redirect to the create_customer page or an error page.

Let me know if you need further assistance!

<h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <label for="service">Select Service:</label> <select name="service"> {% for service in services %} <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option> {% endfor %} </select> <label for="part">Select Part:</label> <select name="part"> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <button type="submit">Calculate Total</button> </form> DESIGN TO LOOK NICE

To design your form with a nicer layout, we can use some basic CSS to improve the form’s presentation. Below is an example that includes some styles to make the form more visually appealing, including spacing, fonts, and button styling.

Here’s the updated HTML with embedded CSS for a better design:

Updated `create_billing.html`:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="text"], input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        .form-group select {
            width: 48%;
        }
        .form-group label {
            flex-basis: 48%;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <div class="form-group">
            <div class="service-section">
                <label for="service">Select Service:</label>
                <select name="service">
                    {% for service in services %}
                        <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                    {% endfor %}
                </select>
            </div>
            
            <div class="part-section">
                <label for="part">Select Part:</label>
                <select name="part">
                    {% for part in parts %}
                        <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
                    {% endfor %}
                </select>
            </div>
        </div>
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Explanation of the Design:

Container Layout: The form is wrapped in a .container class with a width of 60% of the page. This makes the form more centered and gives it a clean, modern look.
Form Flexbox: We use a flexbox for the form, which arranges the form elements in a column layout and uses gap to provide consistent spacing between form elements.
Select Dropdown: The dropdowns for service and part are inside a form-group div with space for each select element to be side-by-side in a cleaner layout.
Button Styling: The button has a green background, white text, and a hover effect to improve interactivity. The button will change color slightly when hovered.
Responsive Design: The form is designed to adapt to different screen sizes. The elements will stack nicely on smaller screens, making the form user-friendly on mobile devices.

Customization Options:

You can easily modify the colors, font sizes, and other styles to match your project’s branding.
If you have additional fields (like quantity), you can use a similar design approach for those as well.

This design should make the form much more user-friendly and visually appealing. Let me know if you want to further refine any part of the design!

To improve the design of the form and make the "Save Customer" button visually appealing, I'll use similar styling principles to the previous design, keeping it clean and user-friendly.

Here's an updated version of your form with enhanced styling:

Updated Form Design:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Create Customer</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 50%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        input[type="text"], input[type="email"], input[type="number"], button {
            padding: 12px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        input[type="text"], input[type="email"], input[type="number"] {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            padding: 12px;
            font-size: 16px;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Create Customer</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}

        <button type="submit">Save Customer</button>
    </form>
</div>

</body>
</html>

Explanation of the Design:

Container Layout: The form is centered in a .container class with a width of 50% of the page to make it visually clean and user-friendly.
Spacing and Alignment: The form fields are given sufficient spacing to avoid crowding. They are displayed one below the other in a column layout.
Button Styling: The "Save Customer" button is styled with a green background, white text, bold font, and rounded corners. It also has a hover effect to improve user interactivity.
Font & Colors: The text is set to a simple, readable font (Arial), and the colors are neutral with a white background to keep the focus on the form fields and button.
Responsive Design: The design will automatically adjust on smaller screens, ensuring the form looks good on both desktop and mobile devices.

This form should now have a clean, modern look while keeping the layout simple and intuitive for the user. You can further adjust the design by modifying the colors, font sizes, or spacing according to your preferences!

To enhance the design of the "Add Vehicle" form, I'll use a clean and modern approach with styling that matches the previous one, focusing on making the form more user-friendly and visually appealing.

Here's an updated version of your form with better design:

Updated Form Design:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Add Vehicle</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 50%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
            font-size: 24px;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        input[type="text"], input[type="email"], input[type="number"], button, select {
            padding: 12px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        input[type="text"], input[type="email"], input[type="number"], select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            padding: 12px;
            font-size: 16px;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Add Vehicle for {{ customer.name }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}

        <button type="submit">Add Vehicle</button>
    </form>
</div>

</body>
</html>

Explanation of the Design:

Container Layout: Just like the previous form, it uses a .container class that holds the form, providing margin and padding for a neat, clean appearance.
Typography and Spacing: The text is styled for clarity with larger headings, and each input field is spaced appropriately for ease of use.
Button Styling: The "Add Vehicle" button is styled to match the previous button's color and hover effects, making it consistent throughout your project.
Form Fields: Inputs and select elements are styled to have consistent padding, border-radius, and font size. This ensures the form elements are easy to read and interact with.
Responsiveness: The form will adjust to smaller screen sizes, maintaining its usability and design integrity on mobile devices.

This form should now provide a modern, user-friendly interface for adding a vehicle, while maintaining visual consistency with the rest of your project.

<h1>Invoice for {{ billing.customer.name }}</h1> <p>Vehicle: {{ billing.vehicle.make }} {{ billing.vehicle.model }}</p> <p>Service: {{ billing.service.name }} - KSH {{ billing.service.cost }}</p> <p>Part: {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p> <p>Total Cost: KSH {{ billing.total_cost }}</p> <p>Payment Method: {{ billing.payment_method }}</p> <p>Amount Paid: KSH {{ billing.payment_amount }}</p> design to look presentable

To design the invoice to look more presentable, we can apply a clean and professional layout that uses styling to highlight key information and ensure everything is well-organized.

Styled Invoice Page:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice for {{ billing.customer.name }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
            color: #333;
        }
        .container {
            width: 60%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
            font-size: 28px;
            margin-bottom: 20px;
        }
        .invoice-info {
            margin-bottom: 20px;
        }
        .invoice-info p {
            font-size: 16px;
            line-height: 1.6;
        }
        .invoice-info p strong {
            font-weight: bold;
        }
        .total-cost {
            margin-top: 20px;
            padding: 15px;
            background-color: #f8f8f8;
            border-left: 4px solid #4CAF50;
        }
        .total-cost p {
            font-size: 18px;
            font-weight: bold;
        }
        .payment-details {
            margin-top: 20px;
            padding: 15px;
            background-color: #f8f8f8;
            border-left: 4px solid #4CAF50;
        }
        .payment-details p {
            font-size: 16px;
        }
        .footer {
            margin-top: 30px;
            text-align: center;
            font-size: 14px;
            color: #888;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Invoice for {{ billing.customer.name }}</h1>
    
    <div class="invoice-info">
        <p><strong>Vehicle:</strong> {{ billing.vehicle.make }} {{ billing.vehicle.model }}</p>
        <p><strong>Service:</strong> {{ billing.service.name }} - KSH {{ billing.service.cost }}</p>
        <p><strong>Part:</strong> {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p>
    </div>
    
    <div class="total-cost">
        <p><strong>Total Cost:</strong> KSH {{ billing.total_cost }}</p>
    </div>
    
    <div class="payment-details">
        <p><strong>Payment Method:</strong> {{ billing.payment_method }}</p>
        <p><strong>Amount Paid:</strong> KSH {{ billing.payment_amount }}</p>
    </div>
    
    <div class="footer">
        <p>Thank you for your business!</p>
    </div>
</div>

</body>
</html>

Key Styling:

Layout: The content is placed within a .container that has a centered, clean, and neat design with rounded corners and a box shadow for a subtle 3D effect.
Typography: The heading h1 is larger for emphasis, and the paragraphs are styled for readability, with clear, concise information.
Total and Payment Details: These sections are highlighted with a background color and a border to draw attention to important information. They have a consistent design with padding and margins to separate each section.
Footer: A small footer at the bottom thanks the customer for their business, which provides a professional touch.
Colors: I used green (#4CAF50) for borders and highlights to make the document feel fresh and professional, while the background is kept light for better readability.

This layout will provide a more professional and polished invoice presentation.

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Invoice for {{ billing.customer.name }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f7f7f7; margin: 0; padding: 0; color: #333; } .container { width: 60%; margin: 40px auto; background-color: #fff; padding: 30px; box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; font-size: 28px; margin-bottom: 20px; } .invoice-info { margin-bottom: 20px; } .invoice-info p { font-size: 16px; line-height: 1.6; } .invoice-info p strong { font-weight: bold; } .total-cost { margin-top: 20px; padding: 15px; background-color: #f8f8f8; border-left: 4px solid #4CAF50; } .total-cost p { font-size: 18px; font-weight: bold; } .payment-details { margin-top: 20px; padding: 15px; background-color: #f8f8f8; border-left: 4px solid #4CAF50; } .payment-details p { font-size: 16px; } .footer { margin-top: 30px; text-align: center; font-size: 14px; color: #888; } </style> </head> <body> <div class="container"> <h1>Invoice for {{ billing.customer.name }}</h1> <div class="invoice-info"> <p><strong>Vehicle:</strong> {{ billing.vehicle.make }} {{ billing.vehicle.model }}</p> <p><strong>Service:</strong> {{ billing.service.name }} - KSH {{ billing.service.cost }}</p> <p><strong>Part:</strong> {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p> </div> <div class="total-cost"> <p><strong>Total Cost:</strong> KSH {{ billing.total_cost }}</p> </div> <div class="payment-details"> <p><strong>Payment Method:</strong> {{ billing.payment_method }}</p> <p><strong>Amount Paid:</strong> KSH {{ billing.payment_amount }}</p> </div> <div class="footer"> <p>Thank you for your business!</p> </div> </div> </body> </html> design is not well aligned also the service parts to select lets work on them

To improve the alignment of the invoice and ensure better presentation, I'll address a few design aspects such as spacing, text alignment, and the layout of the form for selecting services and parts.

We'll also enhance the form for selecting services and parts to ensure that it's aligned and looks organized.

Updated Invoice Page Design:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice for {{ billing.customer.name }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
            color: #333;
        }
        .container {
            width: 70%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            text-align: left;
        }
        h1 {
            text-align: center;
            color: #333;
            font-size: 28px;
            margin-bottom: 30px;
        }
        .invoice-info {
            margin-bottom: 20px;
        }
        .invoice-info p {
            font-size: 16px;
            line-height: 1.6;
            margin: 8px 0;
        }
        .invoice-info p strong {
            font-weight: bold;
        }
        .total-cost, .payment-details {
            margin-top: 20px;
            padding: 15px;
            background-color: #f8f8f8;
            border-left: 4px solid #4CAF50;
            border-radius: 5px;
        }
        .total-cost p, .payment-details p {
            font-size: 18px;
            font-weight: bold;
        }
        .footer {
            margin-top: 30px;
            text-align: center;
            font-size: 14px;
            color: #888;
        }

        /* Style for the service and part selection form */
        .service-part-form {
            margin-top: 20px;
            padding: 20px;
            background-color: #f8f8f8;
            border-left: 4px solid #4CAF50;
            border-radius: 5px;
        }
        .service-part-form label {
            display: block;
            margin-bottom: 10px;
            font-size: 16px;
        }
        .service-part-form select {
            width: 100%;
            padding: 10px;
            font-size: 16px;
            margin-bottom: 20px;
            border-radius: 5px;
            border: 1px solid #ddd;
        }
        .service-part-form button {
            padding: 10px 20px;
            background-color: #4CAF50;
            color: white;
            font-size: 16px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
        }
        .service-part-form button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Invoice for {{ billing.customer.name }}</h1>
    
    <div class="invoice-info">
        <p><strong>Vehicle:</strong> {{ billing.vehicle.make }} {{ billing.vehicle.model }}</p>
        <p><strong>Service:</strong> {{ billing.service.name }} - KSH {{ billing.service.cost }}</p>
        <p><strong>Part:</strong> {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p>
    </div>
    
    <div class="total-cost">
        <p><strong>Total Cost:</strong> KSH {{ billing.total_cost }}</p>
    </div>
    
    <div class="payment-details">
        <p><strong>Payment Method:</strong> {{ billing.payment_method }}</p>
        <p><strong>Amount Paid:</strong> KSH {{ billing.payment_amount }}</p>
    </div>
    
    <!-- Service and Part Selection Form -->
    <div class="service-part-form">
        <h3>Select Service & Part</h3>
        <form method="post">
            {% csrf_token %}
            <label for="service">Select Service:</label>
            <select name="service" required>
                {% for service in services %}
                    <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                {% endfor %}
            </select>
            
            <label for="part">Select Part:</label>
            <select name="part" required>
                {% for part in parts %}
                    <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
                {% endfor %}
            </select>
            
            <button type="submit">Calculate Total</button>
        </form>
    </div>

    <div class="footer">
        <p>Thank you for your business!</p>
    </div>
</div>

</body>
</html>

Improvements:

Alignment: The invoice now uses left-aligned text for the sections (.invoice-info, .total-cost, .payment-details), and the form elements are styled to appear clean and structured.
Spacing and Padding: Increased padding and margins around the sections make the content less cluttered and more visually appealing. Each section is clearly separated.
Service and Part Selection: The form now has proper margins, padding, and design to make the dropdowns for selecting services and parts easier to read and interact with. The button at the bottom also stands out with a color change on hover.
Footer: A footer has been added to thank the customer, placed at the bottom of the page.
Button Styling: The submit button now has a hover effect to make it interactive and visually appealing.

This design will provide a clean, professional look for both the invoice and the service/part selection form.

<div class="service-part-form"> <h3>Select Service & Part</h3> <form method="post"> {% csrf_token %} <label for="service">Select Service:</label> <select name="service" required> {% for service in services %} <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option> {% endfor %} </select> <label for="part">Select Part:</label> <select name="part" required> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <button type="submit">Calculate Total</button> </form> </div> lets work on this

To improve the design of the "Select Service & Part" form, we'll focus on ensuring that the form looks visually appealing and easy to navigate. Below is an enhanced version of the form, with better layout and styling:

Updated Form Design:

html
<div class="service-part-form">
    <h3>Select Service & Part</h3>
    <form method="post">
        {% csrf_token %}
        <div class="form-group">
            <label for="service">Select Service:</label>
            <select name="service" required>
                {% for service in services %}
                    <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                {% endfor %}
            </select>
        </div>

        <div class="form-group">
            <label for="part">Select Part:</label>
            <select name="part" required>
                {% for part in parts %}
                    <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
                {% endfor %}
            </select>
        </div>

        <div class="form-group">
            <button type="submit">Calculate Total</button>
        </div>
    </form>
</div>

Styling for Enhanced Appearance:

html
<style>
    .service-part-form {
        margin-top: 30px;
        padding: 30px;
        background-color: #f9f9f9;
        border-left: 5px solid #4CAF50;
        border-radius: 8px;
        box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
    }
    
    .service-part-form h3 {
        font-size: 24px;
        color: #333;
        margin-bottom: 20px;
    }
    
    .service-part-form .form-group {
        margin-bottom: 20px;
    }

    .service-part-form label {
        display: block;
        font-size: 16px;
        font-weight: bold;
        margin-bottom: 8px;
        color: #333;
    }

    .service-part-form select {
        width: 100%;
        padding: 12px;
        font-size: 16px;
        border: 1px solid #ddd;
        border-radius: 5px;
        background-color: #fff;
    }

    .service-part-form button {
        width: 100%;
        padding: 12px;
        background-color: #4CAF50;
        color: #fff;
        font-size: 16px;
        font-weight: bold;
        border: none;
        border-radius: 5px;
        cursor: pointer;
    }

    .service-part-form button:hover {
        background-color: #45a049;
    }
</style>

Key Features:

Form Structure: Each field (Service and Part) is now wrapped in a div with the class form-group for better separation. This improves the readability and spacing of the elements.
Labels: The labels for Service and Part are more prominent with a larger font size and bold weight to help users understand the fields.
Buttons: The submit button is full-width and has a hover effect that makes it stand out more. It’s styled to match the theme of the form.
Spacing & Alignment: Proper margins and padding make sure there is enough space between elements for a clean, organized look.
Background and Box Shadow: The form has a light background color and a subtle box shadow to make it stand out from the rest of the page content. The left border in green adds a visual cue to make it more distinct.

Example Output:

The form will have two dropdowns (for Service and Part) that are clearly labeled and easy to interact with.
The submit button is styled to look consistent with the design of the rest of the form, and it expands to take up the full width of the form.
All fields are properly spaced, making the form easy to fill out.

This design ensures that the "Select Service & Part" section is visually appealing and user-friendly, with a clean layout and easy-to-read text.

Ah, you’re asking for a design that makes the selection of Service items and Parts items more intuitive and visually appealing. Here’s how we can approach it:

Design Concept:

Organized Dropdowns: We’ll ensure that both Service and Part selection are clearly separated, each with its own dropdown.
Display Service and Part Details: The Service dropdown can show the name of the service and its cost. The Part dropdown can show the part's name and cost, helping users make their choices.
Improved Visual Style: Adding clear separation between the service and part sections for easy navigation.

Here's how you could structure it:

Updated Form for Selecting Service and Part:

html
<div class="service-part-form">
    <h3>Select Service & Part</h3>
    <form method="post">
        {% csrf_token %}
        
        <div class="form-group">
            <label for="service">Select Service:</label>
            <select name="service" required>
                <option value="" disabled selected>Select a Service</option>
                {% for service in services %}
                    <option value="{{ service.id }}">
                        {{ service.name }} - KSH {{ service.cost }}
                    </option>
                {% endfor %}
            </select>
        </div>

        <div class="form-group">
            <label for="part">Select Part:</label>
            <select name="part" required>
                <option value="" disabled selected>Select a Part</option>
                {% for part in parts %}
                    <option value="{{ part.id }}">
                        {{ part.name }} - KSH {{ part.cost }}
                    </option>
                {% endfor %}
            </select>
        </div>

        <div class="form-group">
            <button type="submit">Calculate Total</button>
        </div>
    </form>
</div>

CSS for Styling the Service and Part Selection:

html
<style>
    .service-part-form {
        margin-top: 30px;
        padding: 30px;
        background-color: #f9f9f9;
        border-left: 5px solid #4CAF50;
        border-radius: 8px;
        box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
    }

    .service-part-form h3 {
        font-size: 24px;
        color: #333;
        margin-bottom: 20px;
    }

    .service-part-form .form-group {
        margin-bottom: 20px;
    }

    .service-part-form label {
        display: block;
        font-size: 16px;
        font-weight: bold;
        margin-bottom: 8px;
        color: #333;
    }

    .service-part-form select {
        width: 100%;
        padding: 12px;
        font-size: 16px;
        border: 1px solid #ddd;
        border-radius: 5px;
        background-color: #fff;
        margin-bottom: 10px;
    }

    .service-part-form select:focus {
        outline-color: #4CAF50;
    }

    .service-part-form button {
        width: 100%;
        padding: 12px;
        background-color: #4CAF50;
        color: #fff;
        font-size: 16px;
        font-weight: bold;
        border: none;
        border-radius: 5px;
        cursor: pointer;
    }

    .service-part-form button:hover {
        background-color: #45a049;
    }
</style>

Breakdown of the Design:

Service and Part Dropdowns:
- The options inside each dropdown (<select>) are dynamically populated by the services and parts passed from the backend.
- Each dropdown item shows the name of the service or part along with its cost for easy comparison.
Form Layout:
- The form includes labels and dropdowns clearly separated by styling.
- The Select a Service and Select a Part options are set as the default placeholder, guiding the user to make their selections.
Buttons:
- The submit button (Calculate Total) has a hover effect, making it visually appealing.
Visual Flow:
- The form is organized into sections: first the service selection, then the part selection, followed by the submit button.
- The form will look clean and easy to fill out, with good spacing between elements.

Outcome:

The dropdowns for services and parts will display each item’s name and cost. This allows the user to quickly assess the available options.
The design will be clear and intuitive, allowing users to select a service and part and then submit their choices to calculate the total.

Let me know how it looks or if you'd like any further adjustments!

Got it! If you're referring to ensuring that the dropdowns show something meaningful even when they are empty (for example, when there are no services or parts available), we can enhance the form in the following ways:

Enhancements:

Handle Empty Dropdowns:
- If there are no services or parts available in the database, we can show a default message or a placeholder option like "No services available" or "No parts available."
Fallback Option:
- We can ensure the dropdown still functions properly even when no options are available, by adding a <option> that tells the user to select something, or that no items are available.

Updated Form with Empty Dropdown Handling:

html
<div class="service-part-form">
    <h3>Select Service & Part</h3>
    <form method="post">
        {% csrf_token %}
        
        <div class="form-group">
            <label for="service">Select Service:</label>
            <select name="service" required>
                <option value="" disabled selected>Select a Service</option>
                {% if services %}
                    {% for service in services %}
                        <option value="{{ service.id }}">
                            {{ service.name }} - KSH {{ service.cost }}
                        </option>
                    {% else %}
                        <option disabled>No services available</option>
                    {% endfor %}
                {% else %}
                    <option disabled>No services available</option>
                {% endif %}
            </select>
        </div>

        <div class="form-group">
            <label for="part">Select Part:</label>
            <select name="part" required>
                <option value="" disabled selected>Select a Part</option>
                {% if parts %}
                    {% for part in parts %}
                        <option value="{{ part.id }}">
                            {{ part.name }} - KSH {{ part.cost }}
                        </option>
                    {% else %}
                        <option disabled>No parts available</option>
                    {% endfor %}
                {% else %}
                    <option disabled>No parts available</option>
                {% endif %}
            </select>
        </div>

        <div class="form-group">
            <button type="submit">Calculate Total</button>
        </div>
    </form>
</div>

Explanation:

Checking if There Are Services and Parts:
- We check if services or parts exist by using the {% if services %} and {% if parts %} conditional checks.
- If services or parts exist, they are listed as options in the dropdown.
- If services or parts do not exist, a message is shown ("No services available" or "No parts available"), which disables the dropdown and prevents form submission.
Fallback Option:
- Even if there are no services or parts, the dropdowns still render a placeholder with the message "No services available" or "No parts available," making the form user-friendly and indicating that the user should wait for available options or contact support.

CSS Styling for Empty Dropdowns:

If you'd like to further highlight or style the empty dropdowns differently (for example, changing the background color or the font style), you can adjust the CSS as follows:

html
<style>
    .service-part-form select:disabled {
        background-color: #f0f0f0;
        color: #888;
    }
    .service-part-form option[disabled] {
        color: #888;
        font-style: italic;
    }
</style>

Result:

If services or parts are available: The dropdown will display the available options.
If no services or parts are available: The dropdown will show the message "No services available" or "No parts available" in a disabled state, preventing the user from making a selection.
Clear Guidance: This ensures users understand that the dropdown is temporarily empty and prevents any confusion.

Let me know if you'd like further adjustments to this!

Here's the full code with all the changes incorporated:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Select Service & Part</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
            color: #333;
        }
        .service-part-form {
            width: 60%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h3 {
            text-align: center;
            color: #333;
            font-size: 28px;
            margin-bottom: 20px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            font-size: 16px;
            font-weight: bold;
            margin-bottom: 8px;
            display: block;
        }
        select {
            width: 100%;
            padding: 10px;
            margin-top: 8px;
            border-radius: 5px;
            border: 1px solid #ddd;
            font-size: 16px;
            color: #333;
        }
        button {
            padding: 12px 20px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            width: 100%;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group select:disabled {
            background-color: #f0f0f0;
            color: #888;
        }
        .form-group option[disabled] {
            color: #888;
            font-style: italic;
        }
    </style>
</head>
<body>

<div class="service-part-form">
    <h3>Select Service & Part</h3>
    <form method="post">
        {% csrf_token %}

        <div class="form-group">
            <label for="service">Select Service:</label>
            <select name="service" required>
                <option value="" disabled selected>Select a Service</option>
                {% if services %}
                    {% for service in services %}
                        <option value="{{ service.id }}">
                            {{ service.name }} - KSH {{ service.cost }}
                        </option>
                    {% endfor %}
                {% else %}
                    <option disabled>No services available</option>
                {% endif %}
            </select>
        </div>

        <div class="form-group">
            <label for="part">Select Part:</label>
            <select name="part" required>
                <option value="" disabled selected>Select a Part</option>
                {% if parts %}
                    {% for part in parts %}
                        <option value="{{ part.id }}">
                            {{ part.name }} - KSH {{ part.cost }}
                        </option>
                    {% endfor %}
                {% else %}
                    <option disabled>No parts available</option>
                {% endif %}
            </select>
        </div>

        <div class="form-group">
            <button type="submit">Calculate Total</button>
        </div>
    </form>
</div>

</body>
</html>

Key Changes:

Dropdown for Services and Parts:
- The dropdowns now check if there are services or parts available.
- If services or parts are available, they will be displayed with their respective costs.
- If no services or parts are available, the dropdown will display a message like "No services available" or "No parts available" and will be disabled.
Styling Adjustments:
- I've added a disabled style to the <select> and <option> elements to make it clear when the dropdown is empty.
- The button now has a hover effect to improve user interaction.
- The form is more centered and styled for better user experience.
Form Styling:
- The form is cleanly organized and centered on the page with appropriate padding and margins.
- The select inputs are styled to ensure readability and usability.

This should work well, handling the case when there are no services or parts available and making the user interface more user-friendly. Let me know if you need further adjustments!

To make sure the dropdowns are populated with the correct data (like services and parts), you need to ensure that you're passing the data for services and parts to the template from your Django view. Here's a step-by-step guide to make sure everything works properly:

1. Make sure the context data is passed correctly in your Django view.

Ensure that the services and parts are being passed to your template from the view.

For example, in your view, you should have something like this:

python
from django.shortcuts import render
from .models import Service, Part

def generate_billing(request, vehicle_id):
    vehicle = Vehicle.objects.get(id=vehicle_id)  # Get the vehicle instance
    services = Service.objects.all()  # Fetch all services
    parts = Part.objects.all()  # Fetch all parts

    # Create a form instance (this could be your form or model-based form)
    form = BillingForm()  # Assuming you have a form

    context = {
        'vehicle': vehicle,
        'services': services,
        'parts': parts,
        'form': form
    }

    return render(request, 'billing/generate_billing.html', context)

Make sure that services and parts are populated correctly with data from your database.

2. Check for data in the dropdowns:

You also need to ensure that there are actual Service and Part entries in your database. If there are no services or parts in the database, the dropdown will not show anything.

You can add a few services and parts to your database through Django's admin or the shell:

bash
python manage.py shell

Then:

python
from billing.models import Service, Part

# Add services
Service.objects.create(name="Engine Repair", cost=5000)
Service.objects.create(name="Oil Change", cost=1500)

# Add parts
Part.objects.create(name="Oil Filter", cost=500)
Part.objects.create(name="Spark Plug", cost=200)

3. Ensure the form is correctly included:

If you're using a form to manage the service and part selection, make sure the form is being displayed properly. The code you provided already displays {{ form.as_p }}, which assumes you're using a Django form.

If you're not using a form, you can remove that line. The main thing is ensuring that services and parts are passed correctly.

4. Updated template code:

Once you're sure your context is correctly populated, here’s the updated HTML code, ensuring that it works if you have services and parts:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="text"], input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        .form-group select {
            width: 48%;
        }
        .form-group label {
            flex-basis: 48%;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        <!-- Optional: Include form fields -->
        {{ form.as_p }}
        
        <div class="form-group">
            <div class="service-section">
                <label for="service">Select Service:</label>
                <select name="service" required>
                    <option value="" disabled selected>Select a Service</option>
                    {% if services %}
                        {% for service in services %}
                            <option value="{{ service.id }}">
                                {{ service.name }} - KSH {{ service.cost }}
                            </option>
                        {% endfor %}
                    {% else %}
                        <option disabled>No services available</option>
                    {% endif %}
                </select>
            </div>
            
            <div class="part-section">
                <label for="part">Select Part:</label>
                <select name="part" required>
                    <option value="" disabled selected>Select a Part</option>
                    {% if parts %}
                        {% for part in parts %}
                            <option value="{{ part.id }}">
                                {{ part.name }} - KSH {{ part.cost }}
                            </option>
                        {% endfor %}
                    {% else %}
                        <option disabled>No parts available</option>
                    {% endif %}
                </select>
            </div>
        </div>
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

What you need to check:

Context Data: Verify that services and parts are properly passed from the view.
Data Availability: Ensure that there are services and parts in the database to populate the dropdowns.
Form Handling: The form fields should correctly handle the selected service and part when the form is submitted.

This should now correctly populate the dropdowns with available services and parts. Let me know if you encounter any issues or need further adjustments!

Yes, that’s exactly what I meant! In the view generate_invoice, you're fetching the Billing object by its billing_id and passing it to the template.

Here's the breakdown of how it works:

The Billing.objects.get(id=billing_id) retrieves the specific billing record from the database by its id.
The render function is used to send this billing object to the template ('billing/invoice.html').
In the template, you can then access the billing object to display the related information such as customer details, vehicle details, service, part, cost, and payment information.

The key part is ensuring that the correct data is being passed to the template, and it looks like you're doing that correctly with the generate_invoice view.

If you want to make sure the Billing model and related models (such as Customer, Vehicle, Service, Part, etc.) are being populated properly, you should make sure these related objects are also included in the template, which should work as expected with the billing object.

Here’s a quick reminder of how the template part will look based on your previous request:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice for {{ billing.customer.name }}</title>
    <style>
        /* Your styles here */
    </style>
</head>
<body>

<div class="container">
    <h1>Invoice for {{ billing.customer.name }}</h1>
    
    <div class="invoice-info">
        <p><strong>Vehicle:</strong> {{ billing.vehicle.make }} {{ billing.vehicle.model }}</p>
        <p><strong>Service:</strong> {{ billing.service.name }} - KSH {{ billing.service.cost }}</p>
        <p><strong>Part:</strong> {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p>
    </div>
    
    <div class="total-cost">
        <p><strong>Total Cost:</strong> KSH {{ billing.total_cost }}</p>
    </div>
    
    <div class="payment-details">
        <p><strong>Payment Method:</strong> {{ billing.payment_method }}</p>
        <p><strong>Amount Paid:</strong> KSH {{ billing.payment_amount }}</p>
    </div>
    
    <div class="footer">
        <p>Thank you for your business!</p>
    </div>
</div>

</body>
</html>

Let me know if you'd like me to walk through any part of this process or add more detail!

def generate_billing(request, vehicle_id): vehicle = Vehicle.objects.get(id=vehicle_id) # Get the vehicle instance services = Service.objects.all() # Fetch all services parts = Part.objects.all() # Fetch all parts # Create a form instance (this could be your form or model-based form) form = BillingForm() # Assuming you have a form context = { 'vehicle': vehicle, 'services': services, 'parts': parts, 'form': form } return render(request, 'billing/generate_billing.html', context) merge def generate_invoice(request, billing_id): billing = Billing.objects.get(id=billing_id) # Get the billing by ID return render(request, 'billing/invoice.html', {'billing': billing})

To merge the generate_billing and generate_invoice views, you can modify the generate_billing function to generate the billing and then redirect to the generate_invoice view after successfully creating the billing entry. This way, after the form is submitted, it will first calculate the billing and then allow the user to view the invoice.

Here’s the merged code for both views:

python
from django.shortcuts import render, redirect
from .models import Vehicle, Service, Part, Billing
from .forms import BillingForm

# View to generate billing and then redirect to invoice view
def generate_billing(request, vehicle_id):
    vehicle = Vehicle.objects.get(id=vehicle_id)  # Get the vehicle instance
    services = Service.objects.all()  # Fetch all services
    parts = Part.objects.all()  # Fetch all parts

    # Create a form instance (this could be your form or model-based form)
    form = BillingForm(request.POST or None)  # Handle both GET and POST requests

    if request.method == 'POST' and form.is_valid():
        # Create a Billing instance from the form data
        billing = form.save(commit=False)
        billing.vehicle = vehicle  # Link billing to the specific vehicle
        billing.save()

        # Redirect to the invoice page for the created billing
        return redirect('generate_invoice', billing_id=billing.id)

    context = {
        'vehicle': vehicle,
        'services': services,
        'parts': parts,
        'form': form
    }

    return render(request, 'billing/generate_billing.html', context)

# View to generate invoice for the billing
def generate_invoice(request, billing_id):
    billing = Billing.objects.get(id=billing_id)  # Get the billing by ID
    return render(request, 'billing/invoice.html', {'billing': billing})

Explanation:

generate_billing:
- Fetches the Vehicle, Service, and Part data.
- If the request method is POST and the form is valid, it creates the Billing entry.
- After saving the Billing entry, it redirects to the generate_invoice view, passing the billing_id to generate the invoice.
generate_invoice:
- This function fetches the Billing object using the billing_id and passes it to the invoice.html template for rendering.

URLs:

Make sure you have the appropriate URL mappings in urls.py for both views:

python
from django.urls import path
from . import views

urlpatterns = [
    path('billing/generate/<int:vehicle_id>/', views.generate_billing, name='generate_billing'),
    path('billing/invoice/<int:billing_id>/', views.generate_invoice, name='generate_invoice'),
]

Form Handling:

You will need a BillingForm to handle the form submission. Here's an example:

python
from django import forms
from .models import Billing

class BillingForm(forms.ModelForm):
    class Meta:
        model = Billing
        fields = ['service', 'part', 'part_quantity', 'payment_method', 'payment_amount']

Template `generate_billing.html`:

You should have the form for selecting the service, part, and entering the quantity and payment details. Once the user submits the form, the billing will be created, and they will be redirected to the invoice page.

Let me know if you'd like to adjust any further!

you are not getting me i mean <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } form { display: flex; flex-direction: column; gap: 15px; } label { font-size: 16px; color: #333; } select, input[type="text"], input[type="number"], button { padding: 10px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } select { width: 100%; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; transition: background-color 0.3s ease; } button:hover { background-color: #45a049; } .form-group { display: flex; justify-content: space-between; gap: 20px; } .form-group select { width: 48%; } .form-group label { flex-basis: 48%; } </style> </head> <body> <div class="container"> <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <div class="form-group"> <div class="service-section"> <label for="service">Select Service:</label> <select name="service"> {% for service in services %} <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option> {% endfor %} </select> </div> <div class="part-section"> <label for="part">Select Part:</label> <select name="part"> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> </div> </div> <button type="submit">Calculate Total</button> </form> </div> </body> </html> this drop downs and select are empty how do i go about them

Ah, I understand now! You want to make sure that the "Select Service" and "Select Part" dropdowns are populated with the data that’s fetched from the database in the generate_billing view.

To do this, the dropdowns should populate with the Service and Part models, but it seems like they might not be properly passed or retrieved from the database.

Here’s how you can fix this:

1. Ensure You Pass the `services` and `parts` to the Template:

You need to make sure that your generate_billing view is fetching the Service and Part models and passing them correctly to the template.

Here’s the updated generate_billing view:

python
from django.shortcuts import render, redirect
from .models import Vehicle, Service, Part, Billing
from .forms import BillingForm

def generate_billing(request, vehicle_id):
    vehicle = Vehicle.objects.get(id=vehicle_id)  # Get the vehicle instance
    services = Service.objects.all()  # Fetch all services
    parts = Part.objects.all()  # Fetch all parts

    form = BillingForm(request.POST or None)  # Handle both GET and POST requests

    if request.method == 'POST' and form.is_valid():
        # Create the Billing object and save it
        billing = form.save(commit=False)
        billing.vehicle = vehicle  # Link the billing to the vehicle
        billing.save()

        return redirect('generate_invoice', billing_id=billing.id)  # Redirect to the invoice page

    context = {
        'vehicle': vehicle,
        'services': services,
        'parts': parts,
        'form': form,
    }

    return render(request, 'billing/generate_billing.html', context)

2. Modify the Template:

In your HTML template, make sure you are correctly rendering the services and parts inside the dropdowns. Based on the data being passed to the template (services and parts), the dropdowns will be populated.

Here is the corrected HTML template:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="text"], input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        .form-group select {
            width: 48%;
        }
        .form-group label {
            flex-basis: 48%;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <div class="form-group">
            <!-- Service Dropdown -->
            <div class="service-section">
                <label for="service">Select Service:</label>
                <select name="service" required>
                    {% for service in services %}
                        <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                    {% endfor %}
                </select>
            </div>
            
            <!-- Part Dropdown -->
            <div class="part-section">
                <label for="part">Select Part:</label>
                <select name="part" required>
                    {% for part in parts %}
                        <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
                    {% endfor %}
                </select>
            </div>
        </div>
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Key Changes:

Context in the View: The generate_billing view now correctly passes services and parts to the template.
Dropdown Population: The dropdowns (<select>) for services and parts are populated using the for loop to iterate over services and parts passed from the view.

3. Make Sure Services and Parts Exist in Your Database:

If your dropdowns are still empty, ensure that you have data in your Service and Part models. You can check if these models have records by going to the Django admin panel or running the following commands:

python
from yourapp.models import Service, Part

# Check if services and parts exist
services = Service.objects.all()
parts = Part.objects.all()

If there are no records, you’ll need to add them either via the Django admin or through Django shell.

With these updates, the dropdowns should now properly populate with the available services and parts in your database.

urlpatterns = [ path('', billing_home, name='billing'), path('create_customer/',create_customer, name='create_customer'), path('create_vehicle/<int:customer_id>/', create_vehicle, name='create_vehicle'), path('create_billing/<int:vehicle_id>/',create_billing, name='create_billing'), path('generate_invoice/<int:billing_id>/',generate_invoice, name='generate_invoice'), ] from django.shortcuts import render, redirect, get_object_or_404 from .models import Customer, Vehicle, Billing, Service, Part from .forms import CustomerForm, VehicleForm, BillingForm def billing_home(request): return render(request, 'billing/home.html') def create_customer(request): if request.method == 'POST': form = CustomerForm(request.POST) if form.is_valid(): customer = form.save() return redirect('create_vehicle', customer_id=customer.id) else: form = CustomerForm() return render(request, 'billing/create_customer.html', {'form': form}) def create_vehicle(request, customer_id): customer = Customer.objects.get(id=customer_id) # Get the customer by ID if request.method == 'POST': form = VehicleForm(request.POST) if form.is_valid(): vehicle = form.save(commit=False) vehicle.customer = customer # Link vehicle to the customer vehicle.save() return redirect('create_billing', vehicle_id=vehicle.id) else: form = VehicleForm() return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer}) def create_billing(request, vehicle_id): vehicle = Vehicle.objects.get(id=vehicle_id) # Get the vehicle by ID services = Service.objects.all() # Get all available services parts = Part.objects.all() # Get all available parts if request.method == 'POST': form = BillingForm(request.POST) if form.is_valid(): billing = form.save(commit=False) billing.vehicle = vehicle # Link billing to the vehicle billing.calculate_total() # Calculate the total cost billing.save() return redirect('generate_invoice', billing_id=billing.id) else: form = BillingForm() return render(request, 'billing/create_billing.html', { 'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts }) def generate_billing(request, vehicle_id): vehicle = Vehicle.objects.get(id=vehicle_id) # Get the vehicle instance services = Service.objects.all() # Fetch all services parts = Part.objects.all() # Fetch all parts form = BillingForm(request.POST or None) # Handle both GET and POST requests if request.method == 'POST' and form.is_valid(): # Create the Billing object and save it billing = form.save(commit=False) billing.vehicle = vehicle # Link the billing to the vehicle billing.save() return redirect('generate_invoice', billing_id=billing.id) # Redirect to the invoice page context = { 'vehicle': vehicle, 'services': services, 'parts': parts, 'form': form, } return render(request, 'billing/generate_billing.html', context) def generate_invoice(request, billing_id): billing = Billing.objects.get(id=billing_id) # Get the billing by ID return render(request, 'billing/invoice.html', {'billing': billing}) correct the error show full code?

It seems that you're trying to handle a Django view that generates billing for a vehicle, and your urlpatterns are supposed to handle the different steps of the billing process. I notice a couple of key things that need attention:

1. Fix Duplicate `generate_billing` Function:

There are two generate_billing functions in your code: one in urls.py and another in views.py. You should only have one generate_billing function that handles the form and the rendering of the billing page.

You also have the create_billing function that’s supposed to generate the billing, so having both create_billing and generate_billing is redundant. You should merge the logic into one view and clean up unnecessary duplication.

2. Fix Billing Form Calculation:

You are calling billing.calculate_total(), but you didn't show the calculate_total method in the Billing model. Ensure that method exists in the model.

3. Fix View Logic:

Make sure that you're using get_object_or_404 for safety when querying for objects, to prevent errors in case an object does not exist.

Corrected Full Code:

`urls.py`:

python
from django.urls import path
from .views import billing_home, create_customer, create_vehicle, create_billing, generate_invoice

urlpatterns = [
    path('', billing_home, name='billing'),
    path('create_customer/', create_customer, name='create_customer'),
    path('create_vehicle/<int:customer_id>/', create_vehicle, name='create_vehicle'),
    path('create_billing/<int:vehicle_id>/', create_billing, name='create_billing'),
    path('generate_invoice/<int:billing_id>/', generate_invoice, name='generate_invoice'),
]

`views.py`:

python
from django.shortcuts import render, redirect, get_object_or_404
from .models import Customer, Vehicle, Billing, Service, Part
from .forms import CustomerForm, VehicleForm, BillingForm

def billing_home(request):
    return render(request, 'billing/home.html')

def create_customer(request):
    if request.method == 'POST':
        form = CustomerForm(request.POST)
        if form.is_valid():
            customer = form.save()
            return redirect('create_vehicle', customer_id=customer.id)
    else:
        form = CustomerForm()
    return render(request, 'billing/create_customer.html', {'form': form})

def create_vehicle(request, customer_id):
    customer = get_object_or_404(Customer, id=customer_id)  # Get customer safely
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Link vehicle to the customer
            vehicle.save()
            return redirect('create_billing', vehicle_id=vehicle.id)
    else:
        form = VehicleForm()
    return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer})

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            billing.calculate_total()  # Calculate the total cost
            billing.save()
            return redirect('generate_invoice', billing_id=billing.id)
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)  # Get the billing by ID safely
    return render(request, 'billing/invoice.html', {'billing': billing})

Explanation of Changes:

Safety with get_object_or_404:
- For customer and vehicle, I've replaced Customer.objects.get() and Vehicle.objects.get() with get_object_or_404(). This ensures that the views won’t raise DoesNotExist exceptions if the customer or vehicle is not found. It will instead show a 404 page.
Consolidation of generate_billing and create_billing:
- The generate_billing function from views.py was merged into create_billing, as they essentially serve the same purpose. We’ll keep create_billing as the view responsible for both displaying the form and creating the Billing instance.

Calling calculate_total in the Billing Model:

The calculate_total method in Billing should calculate the total cost based on the selected services and parts. If this method doesn't exist in your Billing model, you'll need to implement it.

Here’s an example of how calculate_total might look in the Billing model:

python
class Billing(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    part = models.ForeignKey(Part, on_delete=models.CASCADE)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, default=0)

    def calculate_total(self):
        # Assuming service and part costs are stored as Decimal fields
        self.total_cost = self.service.cost + self.part.cost
        self.save()

Ensure that service.cost and part.cost are actual fields in the Service and Part models.

Additional Notes:

Form Handling: The BillingForm should include fields for selecting Service and Part. If the form doesn’t have those fields, you need to ensure they're part of the form in your forms.py.
HTML Template (create_billing.html): You should be passing services and parts to the template, which are then used to populate the dropdowns in the HTML template.

Complete `forms.py` Example for `BillingForm`:

Here’s how the form could look, assuming you have a Billing model that references Service and Part:

python
from django import forms
from .models import Billing

class BillingForm(forms.ModelForm):
    class Meta:
        model = Billing
        fields = ['service', 'part']

    # You can also add custom validation or widgets here

Now, everything should be connected, and your views should work as expected.

If the dropdown is empty, there are a few potential reasons for this. Let’s go through the steps to ensure everything is set up correctly:

1. Ensure Services Exist in the Database:

First, make sure that the Service model actually contains data. You can check this in your database or through the Django admin panel.

Run the following Django shell command to check if there are any Service records:

bash
python manage.py shell

python
from yourapp.models import Service
services = Service.objects.all()
print(services)

If there are no services, then the dropdown will indeed be empty. You need to create service records in the database.

2. Check the View for Proper Data Passing:

The services context variable should be passed from the view to the template correctly. In your create_billing view, you should be passing the services like this:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            billing.calculate_total()  # Calculate the total cost
            billing.save()
            return redirect('generate_invoice', billing_id=billing.id)
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form,
        'vehicle': vehicle,
        'services': services,
        'parts': parts
    })

In the code above, I see that you are fetching all the services with Service.objects.all(). Ensure that this query returns a list of services. If it does, then the services context variable is being passed correctly.

3. Template Rendering:

Your HTML snippet looks mostly correct, but let's ensure it's rendering properly.

html
<div class="form-group">
    <label for="service">Select Service:</label>
    <select name="service" required>
        <option value="" disabled selected>Select a Service</option>
        {% if services %}
            {% for service in services %}
                <option value="{{ service.id }}">
                    {{ service.name }} - KSH {{ service.cost }}
                </option>
            {% endfor %}
        {% else %}
            <option disabled>No services available</option>
        {% endif %}
    </select>
</div>

4. Check for Any Query Issues:

Ensure there are no issues with the query. If you want to check whether the services variable is actually populated, you can temporarily add a debug statement in your template:

html
<p>Services: {{ services }}</p>

This will output the services list directly into the page, which can help you verify if any services are passed.

5. Ensure Services Have Valid Data:

Ensure that the Service model has fields name and cost correctly set. Here's an example of what the model might look like:

python
class Service(models.Model):
    name = models.CharField(max_length=200)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return self.name

6. Check for Database Migrations:

If you’ve just created the Service model or made changes to it, make sure to run the migrations to update the database:

bash
python manage.py makemigrations
python manage.py migrate

This ensures that your database is in sync with the model definitions.

7. Try Manually Adding a Service:

In case there’s still no data, try manually adding a Service through Django's admin or using the Django shell.

Example: Adding a Service via Django Shell:

bash
python manage.py shell

python
from yourapp.models import Service

# Create a service
service = Service.objects.create(name="Engine Repair", cost=5000)

Once this is done, reload your page and check the dropdown. The new service should now be available.

Conclusion:

The most common reasons for the dropdown being empty are:

No Service records exist in the database.
The query fetching services is incorrect.
The context variable isn't being passed to the template properly.

By following the above steps, you should be able to debug the issue and get the dropdown populated correctly.

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell >> Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from yourapp.models import Service Traceback (most recent call last): File "<console>", line 1, in <module> ModuleNotFoundError: No module named 'yourapp' >>> services = Service.objects.all() Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Service' is not defined >>> print(services) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'services' is not defined >>>

It looks like you encountered a few issues:

ModuleNotFoundError: The error No module named 'yourapp' occurred because I gave you a placeholder name yourapp for the app where your Service model is located. You should replace yourapp with the actual name of the app where your Service model is defined.
NameError: The error name 'services' is not defined happened because you tried to print services before defining it in the shell.

Here’s how to fix it:

Access the correct app: Replace yourapp with the actual name of your app. For example, if your app is named billing, you should do this:

python
from billing.models import Service

Query the services: Once you’ve imported the correct model, run the following to check if there are any services:

python
services = Service.objects.all()
print(services)

If you see output with service records, it means the query works, and services exist.

If you don't see anything or if it’s empty, then you’ll need to add service records manually or check the database to ensure there are entries in the Service model.

Example to Add Service via Django Shell:

If there are no services, you can add one manually using:

python
# Create a sample service
service = Service.objects.create(name="Oil Change", cost=1500)

Then check if it appears:

python
services = Service.objects.all()
print(services)

This should allow you to confirm if the Service records are available.

Let me know if this works!

The message <QuerySet []> means that there are no records in the Service table in your database. This is why nothing appears in your dropdown.

To resolve this:

Add Services Manually through Django Shell: You can add sample services directly from the Django shell. Here's how you can do it:

python
from billing.models import Service

# Create some services
Service.objects.create(name="Oil Change", cost=1500)
Service.objects.create(name="Tire Rotation", cost=1000)
Service.objects.create(name="Brake Inspection", cost=1200)

After running these commands, you can check if the services are now in the database:

python
services = Service.objects.all()
print(services)

This should print out the services you just added, something like this:

python
<QuerySet [<Service: Oil Change>, <Service: Tire Rotation>, <Service: Brake Inspection>]>

Check in the Admin Panel: If you have Django Admin set up, you can also log in to your admin panel and manually add services through the web interface.
- Go to http://127.0.0.1:8000/admin/ (assuming you're running the server locally).
- Log in with your admin credentials.
- Under your billing app, find the Service model and add services from there.
Verify in your Application: Once services are added, they should appear in the dropdown in your form. Refresh your page, and you should be able to select from the newly added services.

Let me know how it goes!

The issue you're encountering (displaying service object (1)) happens when you try to print the Service model directly. In Django templates, this typically occurs when you try to print a model instance without specifying which attribute of the model you want to display.

Solution:

To fix this, you need to explicitly reference the attributes of the Service model, such as service.name and service.cost, within the <option> tag.

In your case, the line:

html
<option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>

is already correctly displaying the name and cost attributes of each service. If you still see something like service object (1), it may be because:

The service.name or service.cost fields are empty or not defined properly.
- Ensure that each Service object in the database has a name and cost value.

Check the __str__ method in your model.

If you have a __str__ method defined in your Service model, it should return the string representation of the object. For example:

python
class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return self.name  # or return f"{self.name} - KSH {self.cost}"

This ensures that when you try to print service or refer to it in templates, it uses the name and cost fields.

Double-check the services variable in the template context:

Ensure that you're passing the correct services queryset to the template in the view.

python
def create_billing(request, vehicle_id):
    vehicle = Vehicle.objects.get(id=vehicle_id)
    services = Service.objects.all()
    parts = Part.objects.all()
    form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'vehicle': vehicle,
        'services': services,
        'parts': parts,
        'form': form
    })

Summary:

Ensure that the Service model has a proper __str__ method, and that you're passing the services queryset correctly to the template. If the database has data, the code you provided should display the service names and costs without issue.

<div class="form-group"> <label for="service">Select Service:</label> <select name="service" required> <option value="" disabled selected>Select a Service</option> {% if services %} {% for service in services %} <option value="{{ service.name }}"> {{ service.name }} - KSH {{ service.cost }} </option> {% endfor %} {% else %} <option disabled>No services available</option> {% endif %} </select> </div> <div class="form-group"> <label for="part">Select Part:</label> <select name="part" required> <option value="" disabled selected>Select a Part</option> {% if parts %} {% for part in parts %} <option value="{{ part.id }}"> {{ part.name }} - KSH {{ part.cost }} </option> {% endfor %} {% else %} <option disabled>No parts available</option> {% endif %} </select> i want on the front end what is visible is subject object(1)

To avoid displaying subject object(1) in the dropdown options, it's important to ensure that you're correctly referencing the attributes of your Service and Part models, just like I mentioned previously. However, you might be mistakenly referencing the object itself instead of its specific attributes.

From your code:

html
<option value="{{ service.name }}">
    {{ service.name }} - KSH {{ service.cost }}
</option>

This is correct, but if you're seeing subject object(1), it's likely due to:

Incorrectly referencing the object instead of its attributes.

For example, if you are passing a Service or Part object but not accessing its attributes properly (like service.name), it might render the object itself. However, your code seems correct, so there might be another issue.
Passing the wrong attribute for the value in the dropdown options.

For dropdowns, the value attribute is typically used to store the ID (or unique identifier) of the object rather than displaying the name directly. So, you should pass the service.id or part.id as the value rather than service.name or part.name.

Here’s how you can fix it:

Updated Code for Dropdowns:

Service Dropdown:

html
<div class="form-group">
    <label for="service">Select Service:</label>
    <select name="service" required>
        <option value="" disabled selected>Select a Service</option>
        {% if services %}
            {% for service in services %}
                <option value="{{ service.id }}">
                    {{ service.name }} - KSH {{ service.cost }}
                </option>
            {% endfor %}
        {% else %}
            <option disabled>No services available</option>
        {% endif %}
    </select>
</div>

Part Dropdown:

html
<div class="form-group">
    <label for="part">Select Part:</label>
    <select name="part" required>
        <option value="" disabled selected>Select a Part</option>
        {% if parts %}
            {% for part in parts %}
                <option value="{{ part.id }}">
                    {{ part.name }} - KSH {{ part.cost }}
                </option>
            {% endfor %}
        {% else %}
            <option disabled>No parts available</option>
        {% endif %}
    </select>
</div>

Why the Changes?

For the value attribute, I switched from using {{ service.name }} to {{ service.id }} (and similarly for part.id), which is the best practice. This ensures that the dropdown will submit the id of the selected item when the form is submitted, while still displaying the name and cost in the UI.
Ensure Correct Rendering of Attributes:
- Ensure that the service.name, service.cost, and part.name, part.cost fields are properly populated in your database.

Final Check:

Ensure that the services and parts data are being passed correctly to the template context in your view.

Example:

python
def create_billing(request, vehicle_id):
    vehicle = Vehicle.objects.get(id=vehicle_id)  # Get the vehicle by ID
    services = Service.objects.all()  # Get all available services
    parts = Part.objects.all()  # Get all available parts
    form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'vehicle': vehicle,
        'services': services,
        'parts': parts,
        'form': form
    })

Once you ensure this, the dropdowns should show the service names and costs properly, and the value should correctly store the id of the selected item when the form is submitted.

To ensure that you're displaying the real name (e.g., "Oil Change") in your dropdown options rather than seeing something like service object(1) or part object(1), you need to make sure you're accessing the correct fields of the Service and Part models.

If you're seeing something like service object(1) or part object(1), it's usually because you're either:

Using the object itself in the template instead of referencing its attributes, or
Not correctly rendering the name of the object.

Solution:

Ensure you're referencing the correct field in the template.

For instance, if the Service and Part models have a field like name or description, you need to make sure you're referencing that field and not the entire object.

Here’s how to ensure you're accessing the name field:

1. Service Dropdown:

Assuming your Service model has a name field (and possibly a cost field), make sure you are referencing service.name for the visible text and service.id for the value:

html
<div class="form-group">
    <label for="service">Select Service:</label>
    <select name="service" required>
        <option value="" disabled selected>Select a Service</option>
        {% if services %}
            {% for service in services %}
                <option value="{{ service.id }}">
                    {{ service.name }} - KSH {{ service.cost }}
                </option>
            {% endfor %}
        {% else %}
            <option disabled>No services available</option>
        {% endif %}
    </select>
</div>

Explanation: {{ service.name }} will display the name of the service (like "Oil Change"), and {{ service.id }} is used as the value of the option, which will be submitted when the form is submitted.

2. Part Dropdown:

Similarly, for the Part model, ensure you're referencing part.name to display the part's name:

html
<div class="form-group">
    <label for="part">Select Part:</label>
    <select name="part" required>
        <option value="" disabled selected>Select a Part</option>
        {% if parts %}
            {% for part in parts %}
                <option value="{{ part.id }}">
                    {{ part.name }} - KSH {{ part.cost }}
                </option>
            {% endfor %}
        {% else %}
            <option disabled>No parts available</option>
        {% endif %}
    </select>
</div>

Explanation: {{ part.name }} will display the part's name, and {{ part.id }} is the value submitted when the form is submitted.

Step-by-Step Debugging:

Check if the name field exists in the models:
- In your Service and Part models, ensure there's a name field that you're intending to display.
Example:
```
python
class Service(models.Model):
    name = models.CharField(max_length=255)
    cost = models.DecimalField(max_digits=10, decimal_places=2)
    # other fields...
```
If name is the field that stores the service's name (e.g., "Oil Change"), you should use {{ service.name }} in the template.

Ensure services and parts are available:

If you're still seeing "object(1)", that means your services or parts queryset might be empty.
In your view, make sure you're passing services and parts correctly:

python
def create_billing(request, vehicle_id):
    vehicle = Vehicle.objects.get(id=vehicle_id)
    services = Service.objects.all()  # Get all services
    parts = Part.objects.all()  # Get all parts
    form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'vehicle': vehicle,
        'services': services,
        'parts': parts,
        'form': form,
    })

Verify Data in the Shell:

Open the Django shell (python manage.py shell) and check if services and parts are populated:

python
from billing.models import Service, Part
services = Service.objects.all()
print(services)  # Check if it's populated
parts = Part.objects.all()
print(parts)  # Check if it's populated

Final Check:

After ensuring the data is correctly populated, if you still face issues, ensure you're not referencing the model object incorrectly elsewhere in the code.

By following these steps, you should be able to render the actual name of the service (e.g., "Oil Change") in the dropdown, not the object(1) reference.

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from billing.models import Service, Part >>> services = Service.objects.all() >>> print(services) # Check if it's populated <QuerySet [<Service: Service object (4)>, <Service: Service object (5)>]> >>> parts = Part.objects.all() >>> print(parts) # Check if it's populated <QuerySet [<Part: Part object (1)>, <Part: Part object (2)>, <Part: Part object (3)>]> >>>

The issue you're facing seems to be that the __str__ method is not defined for your Service and Part models. By default, Django will display the object in the format <ModelName object (id)>, which is why you're seeing <Service: Service object (4)> and <Part: Part object (1)>.

To fix this and display the actual name or a more meaningful string for these models, you need to define the __str__ method in both the Service and Part models.

Step 1: Define the `str` Method in Models

Here’s how you can modify your Service and Part models to display their names properly in the Django shell and in the front-end dropdown:

1. Update the `Service` model:

In your models.py, ensure you have a __str__ method that returns the name (or whatever field is appropriate for display):

python
class Service(models.Model):
    name = models.CharField(max_length=255)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return self.name  # Display the service name, e.g., "Oil Change"

2. Update the `Part` model:

Similarly, for the Part model:

python
class Part(models.Model):
    name = models.CharField(max_length=255)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return self.name  # Display the part name, e.g., "Engine Oil"

Step 2: Migrate the Changes

After updating your models, make sure to run migrations so Django can update the database if necessary:

Generate migration files:

bash
python manage.py makemigrations

Apply the migrations:
```
bash
python manage.py migrate
```

Step 3: Verify the Changes

Now, in the Django shell, if you check the services and parts again, you should see the actual names instead of object (id):

python
from billing.models import Service, Part

# Check services
services = Service.objects.all()
print(services)  # You should now see the actual service names like "Oil Change"

# Check parts
parts = Part.objects.all()
print(parts)  # You should now see the actual part names like "Engine Oil"

Step 4: Frontend Template

With the __str__ method defined, the dropdowns in your frontend should now show the proper service and part names (e.g., "Oil Change", "Engine Oil") instead of object (id).

Final Template for Dropdowns:

Now, the dropdowns should look like this:

html
<div class="form-group">
    <label for="service">Select Service:</label>
    <select name="service" required>
        <option value="" disabled selected>Select a Service</option>
        {% if services %}
            {% for service in services %}
                <option value="{{ service.id }}">
                    {{ service.name }} - KSH {{ service.cost }}
                </option>
            {% endfor %}
        {% else %}
            <option disabled>No services available</option>
        {% endif %}
    </select>
</div>

<div class="form-group">
    <label for="part">Select Part:</label>
    <select name="part" required>
        <option value="" disabled selected>Select a Part</option>
        {% if parts %}
            {% for part in parts %}
                <option value="{{ part.id }}">
                    {{ part.name }} - KSH {{ part.cost }}
                </option>
            {% endfor %}
        {% else %}
            <option disabled>No parts available</option>
        {% endif %}
    </select>
</div>

With this setup, the dropdowns will display the names of services and parts properly, and they won't show object (id) anymore.

from django.db import models class Customer(models.Model): name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) class Vehicle(models.Model): customer = models.ForeignKey(Customer, on_delete=models.CASCADE) make = models.CharField(max_length=50) model = models.CharField(max_length=50) registration_number = models.CharField(max_length=20) class Service(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) class Part(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) class Billing(models.Model): vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE) service = models.ForeignKey(Service, on_delete=models.CASCADE) part = models.ForeignKey(Part, on_delete=models.CASCADE) part_quantity = models.IntegerField() total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True) payment_method = models.CharField(max_length=50) payment_amount = models.DecimalField(max_digits=10, decimal_places=2) def calculate_total(self): # Calculate total cost: service cost + (part cost * part quantity) return self.service.cost + (self.part.cost * self.part_quantity) def save(self, *args, **kwargs): # Ensure total_cost is calculated before saving if not self.total_cost: self.total_cost = self.calculate_total() super(Billing, self).save(*args, **kwargs) here is my models.py

Your models.py looks well-structured, and the logic in your Billing model for calculating the total cost based on the selected service, part, and quantity seems good. However, it seems there might be a minor issue in the Billing.save() method, where the total_cost is calculated but not directly returned from the calculate_total() method in a way that would update the model instance.

Here’s a suggested update to make sure the total_cost is set correctly before saving the instance:

Updated `Billing` Model:

python
class Billing(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    part = models.ForeignKey(Part, on_delete=models.CASCADE)
    part_quantity = models.IntegerField()
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

    def calculate_total(self):
        # Calculate total cost: service cost + (part cost * part quantity)
        return self.service.cost + (self.part.cost * self.part_quantity)

    def save(self, *args, **kwargs):
        # Ensure total_cost is calculated before saving
        if not self.total_cost:
            self.total_cost = self.calculate_total()
        super(Billing, self).save(*args, **kwargs)

Points to Note:

calculate_total() Method:
- This method correctly calculates the total cost based on the selected service and part costs.
- It adds the service.cost and the product of part.cost and part_quantity.
save() Method:
- You have overridden the save() method to ensure that total_cost is calculated before saving the model instance.
- It's important that the total_cost field is set in the database, so you're calculating it using the calculate_total() method and assigning it to self.total_cost.

Additional Considerations:

Form Validation:
- When you're creating or updating the Billing model from a form, ensure that part_quantity is properly validated and that the service and part choices are correct.
Testing total_cost Calculation:
- After making these changes, test if the total_cost is being calculated properly when creating a Billing instance.

For example, in Django shell:

python
from billing.models import Service, Part, Vehicle, Billing

# Create a service and a part
service = Service.objects.create(name="Oil Change", cost=2000.00)
part = Part.objects.create(name="Oil Filter", cost=500.00)

# Create a vehicle
vehicle = Vehicle.objects.create(make="Toyota", model="Corolla", registration_number="XYZ123")

# Create a billing
billing = Billing.objects.create(
    vehicle=vehicle,
    service=service,
    part=part,
    part_quantity=2,  # Example quantity
    payment_method="Cash",
    payment_amount=3000.00
)

# Check total cost
print(billing.total_cost)  # This should calculate and print the total cost

Displaying Total Cost in the Frontend:

When rendering this in the template, ensure that total_cost is passed to the frontend so it can be displayed properly.

html
<p>Total Cost: KSH {{ billing.total_cost }}</p>

This should work as expected and calculate the total cost based on the service and part selected, as well as the part quantity.

You're correct! The issue you're facing is that the __str__ method is not defined for your Service and Part models. By default, Django will display model instances in the format <ModelName object (id)>, which is why you're seeing something like <Service: Service object (4)> or <Part: Part object (1)> in your select options.

To fix this, you need to define the __str__ method for both the Service and Part models. This method tells Django how to represent instances of the models as strings, which will be used in places like forms and select options.

Solution: Define the `str` method

Here's how you can modify your Service and Part models to include a proper string representation:

Updated Models with `str` Method

python
class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

class Part(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

Explanation:

__str__ Method in Service:
- This method returns a string that combines the name and cost fields, formatted as "Service Name - KSH Service Cost". This ensures that when you display the service in the frontend, you'll see a human-readable name and cost.
__str__ Method in Part:
- Similarly, this method returns a string for the Part model, combining the name and cost fields formatted as "Part Name - KSH Part Cost".

Now, when you print a `Service` or `Part` instance in the Django admin or use it in a template, it will display the name and cost instead of the object ID.

Example of What Will Appear in the Template:

Now, in your HTML template, when you loop over the services and parts, it will display the name and cost properly:

html
<select name="service" required>
    <option value="" disabled selected>Select a Service</option>
    {% if services %}
        {% for service in services %}
            <option value="{{ service.id }}">
                {{ service }}  <!-- This will display the service name and cost -->
            </option>
        {% endfor %}
    {% else %}
        <option disabled>No services available</option>
    {% endif %}
</select>

<select name="part" required>
    <option value="" disabled selected>Select a Part</option>
    {% if parts %}
        {% for part in parts %}
            <option value="{{ part.id }}">
                {{ part }}  <!-- This will display the part name and cost -->
            </option>
        {% endfor %}
    {% else %}
        <option disabled>No parts available</option>
    {% endif %}
</select>

Expected Output:

For Service: The select options will show "Oil Change - KSH 2000.00".
For Part: The select options will show "Oil Filter - KSH 500.00".

With these changes, you should now see the name and cost for each service and part in your frontend dropdown, rather than the <Service: Service object (id)> or <Part: Part object (id)> format.

Yes, after modifying the models to add the __str__ method, you should run migrations to apply any changes to the database.

In this case, the change is related to how the models are represented as strings and does not affect the database schema itself, so you technically don’t need to run migrations for this change. The __str__ method is purely for representation purposes and doesn't alter the database structure.

However, if you're not sure about whether the migration system has picked up your models correctly or if you're unsure whether there are other changes in your models, it's always a good idea to run the migration commands. Here’s how you can do it:

Steps to Run Migrations:

Make Migrations: Run this command to generate migration files based on any changes you've made to the models:
```
bash
python manage.py makemigrations
```
This will create migration files if there are any changes in the models.
Apply Migrations: Then, run this command to apply those migrations to the database:
```
bash
python manage.py migrate
```

Conclusion:

If you only added the __str__ method, the migrations may not be required since this change doesn't affect the database schema.
Running makemigrations and migrate is a good practice to ensure the Django project is in sync with the database.

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations No changes detected (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, sessions Running migrations: No migrations to apply. (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

Since you've run makemigrations and migrate, and Django reports "No changes detected" and "No migrations to apply," it means that your changes (like adding the __str__ method) have not affected the database schema and thus don't require any migrations.

This is normal for changes that only modify how objects are displayed (like adding __str__) but don't change the database structure itself. Since you added the __str__ method, your Service and Part objects should now display their names (not the object representation) in templates and the admin.

You can now proceed with testing to ensure that the services and parts are displayed properly in your forms and templates.

Try reloading your page where you're displaying the service and part options to see if they now show the actual names rather than <Service: Service object (4)>. Let me know if it's working now!

<div class="service-part-form"> <h3>Select Service & Part</h3> <form method="post"> {% csrf_token %} <div class="form-group"> <label for="service">Select Service:</label> <select name="service" required> <option value="" disabled selected>Select a Service</option> {% if services %} {% for service in services %} <option value="{{ service.id }}"> {{ service.name }} - KSH {{ service.cost }} </option> {% endfor %} {% else %} <option disabled>No services available</option> {% endif %} </select> </div> <div class="form-group"> <label for="part">Select Part:</label> <select name="part" required> <option value="" disabled selected>Select a Part</option> {% if parts %} {% for part in parts %} <option value="{{ part.id }}"> {{ part.name }} - KSH {{ part.cost }} </option> {% endfor %} {% else %} <option disabled>No parts available</option> {% endif %} </select> </div> <div class="form-group"> <button type="submit">Calculate Total</button> </div> </form> </div> whats the purpose of the following

The code you've shared is for a form where users can select a service and a part to calculate a total. Here's a breakdown of the purpose of each section:

1. Service Dropdown (`<select name="service" required>`)

Purpose: This dropdown allows the user to choose a service (like an oil change, tire replacement, etc.) from a list of available services. The options are populated dynamically using a for loop that iterates over the services object passed from the view.
Usage: When the form is submitted, the selected service.id (the unique identifier) will be sent in the form data.
Default Option: Select a Service is the default prompt, and users are required to select one (because of the required attribute).

2. Part Dropdown (`<select name="part" required>`)

Purpose: This dropdown allows the user to choose a part (like a car battery, brake pads, etc.) from a list of available parts. Similarly, the options are populated dynamically using a for loop that iterates over the parts object passed from the view.
Usage: When the form is submitted, the selected part.id will be sent as part of the form data.
Default Option: Select a Part is the default prompt, and users are required to select one as well.

3. CSRF Token (`{% csrf_token %}`)

Purpose: This is a security feature in Django to prevent Cross-Site Request Forgery (CSRF) attacks. It ensures that the form submission is from a trusted source.
Usage: This token is automatically included in the form when using Django's template language. It needs to be included in all forms that modify data in your system.

4. Submit Button (`<button type="submit">Calculate Total</button>`)

Purpose: This button submits the form. When clicked, the form data (including the selected service, part, and any other fields) will be sent to the server for processing.
Usage: Once the user selects a service and part, they can press this button to submit the form, which will then calculate the total cost based on the selected service and part.

Overall Purpose of the Form:

This form allows the user to:

Select a service from a list of available services.
Select a part from a list of available parts.
Submit the form to calculate the total cost by considering the selected service and part.

The total cost calculation likely happens in your Django view, where the service cost and part cost are used to compute the overall total.

The issue you're describing likely stems from the fact that the services and parts data are not being correctly passed to the template or the data is not being populated in the database. Let's go step by step to solve this:

1. Verify Data in Database:

You mentioned earlier that the services and parts tables have no data, which is why nothing is available to be selected in the dropdowns. Ensure that you have added some services and parts in your database.

You can do this in Django's shell:

bash
python manage.py shell

Then, create a few services and parts if they don’t exist yet:

python
from billing.models import Service, Part

# Add some services
Service.objects.create(name="Oil Change", cost=2000.00)
Service.objects.create(name="Tire Replacement", cost=5000.00)

# Add some parts
Part.objects.create(name="Car Battery", cost=8000.00)
Part.objects.create(name="Brake Pads", cost=3000.00)

2. Check if Data is Available in the Template:

Now that you have some data, let's ensure it's being passed correctly to your template.

In the view function, make sure you're querying the services and parts and passing them to the template context. For example:

python
def create_billing(request, vehicle_id):
    vehicle = Vehicle.objects.get(id=vehicle_id)  # Get the vehicle by ID
    services = Service.objects.all()  # Get all available services
    parts = Part.objects.all()  # Get all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            billing.save()
            return redirect('generate_invoice', billing_id=billing.id)
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

This ensures that services and parts are passed to the template.

3. Update Template with Proper Iteration:

Ensure your template uses the passed data correctly. You can modify the dropdowns as follows to ensure that the service and part options are properly displayed.

html
<div class="form-group">
    <label for="service">Select Service:</label>
    <select name="service" required>
        <option value="" disabled selected>Select a Service</option>
        {% if services %}
            {% for service in services %}
                <option value="{{ service.id }}">
                    {{ service.name }} - KSH {{ service.cost }}
                </option>
            {% endfor %}
        {% else %}
            <option disabled>No services available</option>
        {% endif %}
    </select>
</div>

<div class="form-group">
    <label for="part">Select Part:</label>
    <select name="part" required>
        <option value="" disabled selected>Select a Part</option>
        {% if parts %}
            {% for part in parts %}
                <option value="{{ part.id }}">
                    {{ part.name }} - KSH {{ part.cost }}
                </option>
            {% endfor %}
        {% else %}
            <option disabled>No parts available</option>
        {% endif %}
    </select>
</div>

4. Testing the Flow:

Check Data: Ensure that the services and parts tables have data in the admin or shell.
Pass Data: Ensure that the view passes the services and parts to the template.
Select Option: When you visit the form, you should now be able to select a service and part from the dropdown.

Additional Debugging:

If the form still doesn't work correctly:

Check for JavaScript Errors: If you have any JavaScript interfering with the form, open the browser developer tools (F12) and check for errors in the console.
Test the Form Submission: Check if the form data is being submitted correctly (you can use print(request.POST) in your view to debug).
Confirm Form Logic: Make sure that when the form is submitted, the logic for calculating the total cost works correctly by using the calculate_total() method.

Let me know if this helps or if you'd like further assistance!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Select Service & Part</title> <style> body { font-family: Arial, sans-serif; background-color: #f7f7f7; margin: 0; padding: 0; color: #333; } .service-part-form { width: 60%; margin: 40px auto; background-color: #fff; padding: 30px; box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1); border-radius: 8px; } h3 { text-align: center; color: #333; font-size: 28px; margin-bottom: 20px; } .form-group { margin-bottom: 20px; } label { font-size: 16px; font-weight: bold; margin-bottom: 8px; display: block; } select { width: 100%; padding: 10px; margin-top: 8px; border-radius: 5px; border: 1px solid #ddd; font-size: 16px; color: #333; } button { padding: 12px 20px; background-color: #4CAF50; color: white; border: none; border-radius: 5px; cursor: pointer; font-size: 16px; width: 100%; } button:hover { background-color: #45a049; } .form-group select:disabled { background-color: #f0f0f0; color: #888; } .form-group option[disabled] { color: #888; font-style: italic; } </style> </head> <body> <div class="service-part-form"> <h3>Select Service & Part</h3> <form method="post"> {% csrf_token %} <div class="form-group"> <label for="service">Select Service:</label> <select name="service" required> <option value="" disabled selected>Select a Service</option> {% if services %} {% for service in services %} <option value="{{ service.id }}"> {{ service.name }} - KSH {{ service.cost }} </option> {% endfor %} {% else %} <option disabled>No services available</option> {% endif %} </select> </div> <div class="form-group"> <label for="part">Select Part:</label> <select name="part" required> <option value="" disabled selected>Select a Part</option> {% if parts %} {% for part in parts %} <option value="{{ part.id }}"> {{ part.name }} - KSH {{ part.cost }} </option> {% endfor %} {% else %} <option disabled>No parts available</option> {% endif %} </select> </div> <div class="form-group"> <button type="submit">Calculate Total</button> </div> </form> </div> </body> </html> merge with the above

To merge your current code with the previous HTML template, I’ll ensure the structure remains consistent, with the appropriate logic for displaying services and parts, and the correct design elements for styling. Here’s the complete merged code:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Select Service & Part</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
            color: #333;
        }
        .service-part-form {
            width: 60%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h3 {
            text-align: center;
            color: #333;
            font-size: 28px;
            margin-bottom: 20px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            font-size: 16px;
            font-weight: bold;
            margin-bottom: 8px;
            display: block;
        }
        select {
            width: 100%;
            padding: 10px;
            margin-top: 8px;
            border-radius: 5px;
            border: 1px solid #ddd;
            font-size: 16px;
            color: #333;
        }
        button {
            padding: 12px 20px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            width: 100%;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group select:disabled {
            background-color: #f0f0f0;
            color: #888;
        }
        .form-group option[disabled] {
            color: #888;
            font-style: italic;
        }
    </style>
</head>
<body>

<div class="service-part-form">
    <h3>Select Service & Part</h3>
    <form method="post">
        {% csrf_token %}

        <div class="form-group">
            <label for="service">Select Service:</label>
            <select name="service" required>
                <option value="" disabled selected>Select a Service</option>
                {% if services %}
                    {% for service in services %}
                        <option value="{{ service.id }}">
                            {{ service.name }} - KSH {{ service.cost }}
                        </option>
                    {% endfor %}
                {% else %}
                    <option disabled>No services available</option>
                {% endif %}
            </select>
        </div>

        <div class="form-group">
            <label for="part">Select Part:</label>
            <select name="part" required>
                <option value="" disabled selected>Select a Part</option>
                {% if parts %}
                    {% for part in parts %}
                        <option value="{{ part.id }}">
                            {{ part.name }} - KSH {{ part.cost }}
                        </option>
                    {% endfor %}
                {% else %}
                    <option disabled>No parts available</option>
                {% endif %}
            </select>
        </div>

        <div class="form-group">
            <button type="submit">Calculate Total</button>
        </div>
    </form>
</div>

</body>
</html>

Explanation of the Changes:

Form Fields:
- I’ve kept your original form structure intact with service and part dropdown fields.
- The dropdowns will display options like service.name and part.name with their corresponding cost (service.cost and part.cost).
CSS Styling:
- Your provided styles are incorporated as they were. These styles ensure that the form is visually appealing, with proper spacing, padding, and button hover effects.
Service and Part Selection:
- The dropdowns will only show available services and parts, as the view ensures the services and parts are passed to the template. If there are no available services or parts, the corresponding message will display (No services available or No parts available).
Submission:
- Upon submitting the form, it will send a POST request, and you can handle the service and part selections in the backend to calculate the total cost.

Next Steps:

Ensure Data in Database:
- Make sure that your Service and Part tables are populated with data so that they can appear in the dropdown.
Backend Handling:
- You can handle the form submission in the corresponding view, where the selected service and part are used to calculate the total cost and save the data.

Let me know if you need any additional adjustments!

To generate an invoice in Django, the view you've written (generate_invoice) fetches the Billing object by its id and then renders the invoice.html template with that object. However, you may want to display more details (such as customer, vehicle, service, parts, and total cost) within the invoice.

Here’s a breakdown of what you could improve or add to the view to ensure you generate the invoice correctly:

Updated View Logic

python
from django.shortcuts import render, get_object_or_404
from .models import Billing

def generate_invoice(request, billing_id):
    # Fetch the Billing object by its ID or return a 404 if it doesn't exist
    billing = get_object_or_404(Billing, id=billing_id)

    # You can include related models like Customer, Vehicle, Service, and Part
    customer = billing.vehicle.customer  # Access customer through vehicle
    service = billing.service  # Access the service selected in the billing
    part = billing.part  # Access the part selected in the billing

    # Pass all necessary context to the template
    return render(request, 'billing/invoice.html', {
        'billing': billing,
        'customer': customer,
        'service': service,
        'part': part,
        'vehicle': billing.vehicle,
    })

Explanation:

Customer Information: The customer is accessed via billing.vehicle.customer, because Billing has a foreign key to Vehicle, and Vehicle has a foreign key to Customer. This allows you to pull customer details into the invoice.
Service and Part: Since the Billing object holds references to both Service and Part, you can directly pass them into the template to show the detailed breakdown of the invoice.
Vehicle Information: Similarly, you can pass the vehicle object, which is part of the billing object, to display vehicle-related details.

Example Template (`invoice.html`):

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice - {{ customer.name }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            color: #333;
        }
        .invoice-container {
            width: 80%;
            margin: 40px auto;
            padding: 20px;
            background-color: #fff;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        .invoice-details {
            margin-top: 30px;
        }
        .invoice-details table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 20px;
        }
        .invoice-details th, .invoice-details td {
            padding: 10px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }
        .total {
            font-size: 18px;
            font-weight: bold;
            text-align: right;
        }
        .footer {
            text-align: center;
            margin-top: 40px;
            font-size: 14px;
            color: #888;
        }
    </style>
</head>
<body>

<div class="invoice-container">
    <h1>Invoice</h1>

    <div class="invoice-details">
        <h3>Customer Details:</h3>
        <table>
            <tr>
                <th>Name:</th>
                <td>{{ customer.name }}</td>
            </tr>
            <tr>
                <th>Email:</th>
                <td>{{ customer.email }}</td>
            </tr>
            <tr>
                <th>Phone:</th>
                <td>{{ customer.phone }}</td>
            </tr>
        </table>
    </div>

    <div class="invoice-details">
        <h3>Vehicle Details:</h3>
        <table>
            <tr>
                <th>Make:</th>
                <td>{{ vehicle.make }}</td>
            </tr>
            <tr>
                <th>Model:</th>
                <td>{{ vehicle.model }}</td>
            </tr>
            <tr>
                <th>Registration Number:</th>
                <td>{{ vehicle.registration_number }}</td>
            </tr>
        </table>
    </div>

    <div class="invoice-details">
        <h3>Service Details:</h3>
        <table>
            <tr>
                <th>Service Name:</th>
                <td>{{ service.name }}</td>
            </tr>
            <tr>
                <th>Service Cost:</th>
                <td>KSH {{ service.cost }}</td>
            </tr>
        </table>
    </div>

    <div class="invoice-details">
        <h3>Part Details:</h3>
        <table>
            <tr>
                <th>Part Name:</th>
                <td>{{ part.name }}</td>
            </tr>
            <tr>
                <th>Part Cost:</th>
                <td>KSH {{ part.cost }}</td>
            </tr>
            <tr>
                <th>Part Quantity:</th>
                <td>{{ billing.part_quantity }}</td>
            </tr>
        </table>
    </div>

    <div class="total">
        <p>Total Cost: KSH {{ billing.total_cost }}</p>
    </div>

    <div class="footer">
        <p>&copy; 2025 Garage System. All rights reserved.</p>
    </div>
</div>

</body>
</html>

Explanation of the Template:

Customer and Vehicle Info: The template includes sections for displaying customer and vehicle information by accessing the passed customer and vehicle objects.
Service and Part Info: It also displays the details of the service and part used, as well as their respective costs.
Total Cost: The total cost is displayed at the bottom, calculated based on the billing data (billing.total_cost).
Footer: A footer has been added for styling.

Final Thoughts:

After adding this view and template, ensure you have a URL route for this view and that billing_id is passed correctly.
Ensure that the Billing model has the correct related data, and all objects (service, part, vehicle, etc.) are populated correctly.

This should allow you to generate and display a detailed invoice based on the selected billing record. Let me know if you need further adjustments!

If you want to display only the service selection without the parts selection, you can simplify the form and remove the parts-related code. Here’s how you can modify the HTML template:

Updated Template (Only Service Selection)

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="text"], input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        .form-group select {
            width: 48%;
        }
        .form-group label {
            flex-basis: 48%;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <div class="form-group">
            <div class="service-section">
                <label for="service">Select Service:</label>
                <select name="service" required>
                    <option value="" disabled selected>Select a Service</option>
                    {% for service in services %}
                        <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                    {% endfor %}
                </select>
            </div>
        </div>
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Changes:

Removed Parts Section: The entire part selection (<div class="part-section">) has been removed, leaving only the service selection.
Required Attribute: Added the required attribute to the service <select> tag, ensuring the user must choose a service.

What Will Happen:

The form will now only display a dropdown menu for the user to select a service.
When the form is submitted, the service will be processed, and no part-related data will be included in the calculation or form.

View Update (If Required):

You can keep the view the same, as it’s already set up to handle the service selection.

python
def generate_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle object by ID
    services = Service.objects.all()  # Get all available services

    if request.method == 'POST':
        service_id = request.POST.get('service')
        service = get_object_or_404(Service, id=service_id)  # Get selected service
        
        # Create a billing entry for the selected service (you could add more logic here)
        billing = Billing.objects.create(vehicle=vehicle, service=service, total_cost=service.cost)
        
        # Redirect or return a response with the billing information
        return render(request, 'billing/billing_summary.html', {'billing': billing})

    return render(request, 'billing/generate_billing.html', {'vehicle': vehicle, 'services': services})

This will now generate a billing form with only a service selection.

If the customer is only interested in a service and not the parts, you can handle this scenario by either making the parts selection optional or removing the parts section entirely when the customer is not choosing any parts.

Option 1: Make the Parts Selection Optional

You can make the part selection optional by adding a conditional check in your HTML template to only display the parts selection if there are parts available or if the customer has selected a part.

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="text"], input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        .form-group select {
            width: 48%;
        }
        .form-group label {
            flex-basis: 48%;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <div class="form-group">
            <div class="service-section">
                <label for="service">Select Service:</label>
                <select name="service" required>
                    <option value="" disabled selected>Select a Service</option>
                    {% for service in services %}
                        <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                    {% endfor %}
                </select>
            </div>
            
            <!-- Display part selection only if parts are available -->
            {% if parts %}
                <div class="part-section">
                    <label for="part">Select Part (Optional):</label>
                    <select name="part">
                        <option value="" disabled selected>Select a Part (Optional)</option>
                        {% for part in parts %}
                            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
                        {% endfor %}
                    </select>
                </div>
            {% endif %}
        </div>
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Changes:

Optional Part Selection:
- The part selection dropdown is wrapped in a {% if parts %} block. This ensures that if no parts are available, the part section is completely hidden. If parts are available, it will appear as optional.
Updated Part Dropdown:
- I added an option within the part dropdown (<option value="" disabled selected>Select a Part (Optional)</option>), making it clear to the user that selecting a part is optional.

Option 2: Only Service (No Part)

If you are sure the customer is only getting a service (and no part), you can remove the entire part selection section.

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="text"], input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        .form-group select {
            width: 48%;
        }
        .form-group label {
            flex-basis: 48%;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <div class="form-group">
            <div class="service-section">
                <label for="service">Select Service:</label>
                <select name="service" required>
                    <option value="" disabled selected>Select a Service</option>
                    {% for service in services %}
                        <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                    {% endfor %}
                </select>
            </div>
        </div>
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

What's Changed:

Removed Part Section: The entire <div class="part-section"> has been removed, leaving only the service selection.

Handling in Views (Optional):

If you want to allow for flexibility in your views to handle both cases (service only or service + part), you can handle the logic accordingly in your view.

python
def generate_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)
    services = Service.objects.all()
    parts = Part.objects.all()  # If parts are available

    if request.method == 'POST':
        service_id = request.POST.get('service')
        service = get_object_or_404(Service, id=service_id)  # Get selected service
        part_id = request.POST.get('part')  # Optional part selection

        # Create the billing entry
        billing = Billing.objects.create(vehicle=vehicle, service=service, total_cost=service.cost)

        if part_id:
            part = get_object_or_404(Part, id=part_id)
            billing.part = part
            billing.total_cost += part.cost  # Add part cost to total
            billing.save()

        return render(request, 'billing/billing_summary.html', {'billing': billing})

    return render(request, 'billing/generate_billing.html', {'vehicle': vehicle, 'services': services, 'parts': parts})

Summary:

If you want parts as optional, make sure the parts section is conditionally displayed based on available parts or set it as optional.
If only the service is needed, remove the part section completely.

def generate_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) services = Service.objects.all() parts = Part.objects.all() # If parts are available if request.method == 'POST': service_id = request.POST.get('service') service = get_object_or_404(Service, id=service_id) # Get selected service part_id = request.POST.get('part') # Optional part selection # Create the billing entry billing = Billing.objects.create(vehicle=vehicle, service=service, total_cost=service.cost) if part_id: part = get_object_or_404(Part, id=part_id) billing.part = part billing.total_cost += part.cost # Add part cost to total billing.save() return render(request, 'billing/billing_summary.html', {'billing': billing}) return render(request, 'billing/generate_billing.html', {'vehicle': vehicle, 'services': services, 'parts': parts}) it is create_billing not generate

Got it! You've updated the function name to create_billing. This function handles creating a billing entry, where the service is mandatory, but parts are optional. If the customer chooses a part, the part cost is added to the total cost of the service. It also returns the billing summary after the form is submitted. Is there anything specific you'd like to adjust or improve in this flow?

Here’s the merged version of your view function combining the logic from generate_billing with the form handling from create_billing:

python
from django.shortcuts import render, get_object_or_404, redirect
from .models import Vehicle, Service, Part, Billing
from .forms import BillingForm

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            
            # Get selected service
            service_id = request.POST.get('service')
            service = get_object_or_404(Service, id=service_id)  # Get selected service
            billing.service = service  # Assign the service to the billing
            
            # Calculate the total cost: service cost
            billing.total_cost = service.cost

            # Handle optional part selection
            part_id = request.POST.get('part')
            if part_id:
                part = get_object_or_404(Part, id=part_id)
                billing.part = part  # Link the selected part to the billing
                billing.total_cost += part.cost  # Add part cost to the total

            billing.save()  # Save the billing instance
            return redirect('generate_invoice', billing_id=billing.id)  # Redirect to invoice page
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

Key changes:

Fetching the selected service and part: The service is required, and the part is optional. If the customer selects a part, it will be added to the total cost.
Form handling (BillingForm): After the form is submitted, it will validate, calculate the total cost based on the selected service and optionally the part, and then save the billing entry.
Redirection: After successfully saving the billing, the user is redirected to the invoice generation page with the billing_id passed as a parameter.

This should now provide the functionality where the service is mandatory, parts are optional, and the total is calculated accordingly.

To make both the service and part fields optional in your create_billing view, you can adjust the form handling so that the user is not forced to select either the service or part. Here's an updated version of the create_billing function with these adjustments:

Remove the required constraint from the service and part fields.
Handle cases where the user may not select a service or part: If a service or part is not selected, just calculate the total cost accordingly.

Here’s the updated version of your create_billing function:

python
from django.shortcuts import render, get_object_or_404, redirect
from .models import Vehicle, Service, Part, Billing
from .forms import BillingForm

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            
            # Get selected service (optional)
            service_id = request.POST.get('service')
            if service_id:  # Only get the service if it is selected
                service = get_object_or_404(Service, id=service_id)
                billing.service = service  # Assign the service to the billing
                billing.total_cost = service.cost  # Set total cost as service cost
            else:
                billing.total_cost = 0  # If no service is selected, set total to 0

            # Handle optional part selection
            part_id = request.POST.get('part')
            if part_id:
                part = get_object_or_404(Part, id=part_id)
                billing.part = part  # Link the selected part to the billing
                billing.total_cost += part.cost  # Add part cost to the total

            billing.save()  # Save the billing instance
            return redirect('generate_invoice', billing_id=billing.id)  # Redirect to invoice page
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

Explanation of Changes:

Optional service selection:
- I added an if statement to check if service_id is provided. If it is, it fetches the corresponding service and sets the total_cost to the service cost. If not, the total_cost is set to 0.
Optional part selection:
- The part selection logic remains the same but is now optional. If a part is selected, its cost is added to the total_cost.

Form Adjustments:

If you're using a BillingForm and want to make sure the service and part fields are optional there too, you might want to adjust your form fields to make them not required. This can be done by ensuring that the required attribute is set to False for both the service and part fields in your BillingForm.

For example, in your forms.py, make sure your form fields are not required:

python
from django import forms
from .models import Billing

class BillingForm(forms.ModelForm):
    class Meta:
        model = Billing
        fields = ['service', 'part', 'payment_method', 'payment_amount']  # Add the relevant fields here

    service = forms.ModelChoiceField(queryset=Service.objects.all(), required=False)
    part = forms.ModelChoiceField(queryset=Part.objects.all(), required=False)

This will make both the service and part fields optional when the form is rendered.

To use Service and Billing in your views, you need to import them at the top of your views.py file. Here's how you can import both models:

python
from .models import Service, Billing

So your views.py would look like this:

python
from django.shortcuts import render, get_object_or_404, redirect
from .models import Vehicle, Service, Part, Billing  # Import your models
from .forms import BillingForm

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            
            # Get selected service (optional)
            service_id = request.POST.get('service')
            if service_id:  # Only get the service if it is selected
                service = get_object_or_404(Service, id=service_id)
                billing.service = service  # Assign the service to the billing
                billing.total_cost = service.cost  # Set total cost as service cost
            else:
                billing.total_cost = 0  # If no service is selected, set total to 0

            # Handle optional part selection
            part_id = request.POST.get('part')
            if part_id:
                part = get_object_or_404(Part, id=part_id)
                billing.part = part  # Link the selected part to the billing
                billing.total_cost += part.cost  # Add part cost to the total

            billing.save()  # Save the billing instance
            return redirect('generate_invoice', billing_id=billing.id)  # Redirect to invoice page
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

In this case:

Service: Imported from your models.py file, assuming you have defined it as a model there.
Billing: Also imported from your models.py, where the Billing model is defined.

If you don't have a models.py file with those models, you would need to create those models in the appropriate file. Here's a quick example of how these models could be defined:

python
# models.py

from django.db import models

class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return self.name

class Part(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return self.name

class Billing(models.Model):
    vehicle = models.ForeignKey('Vehicle', on_delete=models.CASCADE)  # Assuming a Vehicle model exists
    service = models.ForeignKey(Service, null=True, blank=True, on_delete=models.SET_NULL)
    part = models.ForeignKey(Part, null=True, blank=True, on_delete=models.SET_NULL)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2)
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

    def calculate_total(self):
        total = self.service.cost if self.service else 0
        if self.part:
            total += self.part.cost
        self.total_cost = total

Make sure to adjust these models as needed depending on your actual project requirements.

Here's the modified HTML template to match the changes, where both the service and part selections are not required, and parts will only appear if available:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="text"], input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        .form-group select {
            width: 48%;
        }
        .form-group label {
            flex-basis: 48%;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <div class="form-group">
            <div class="service-section">
                <label for="service">Select Service:</label>
                <select name="service">
                    <option value="" disabled selected>Select a Service</option>
                    {% for service in services %}
                        <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                    {% endfor %}
                </select>
            </div>
            
            <!-- Display part selection only if parts are available -->
            {% if parts %}
                <div class="part-section">
                    <label for="part">Select Part (Optional):</label>
                    <select name="part">
                        <option value="" disabled selected>Select a Part (Optional)</option>
                        {% for part in parts %}
                            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
                        {% endfor %}
                    </select>
                </div>
            {% endif %}
        </div>
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Changes made:

Service Selection: The service dropdown is no longer required (required attribute removed), so customers can choose to leave it unselected.
Part Selection (Optional): The part selection dropdown will only appear if there are available parts ({% if parts %}). Also, the part selection is optional, so the user can skip it.
No required attribute on the service and part selects: Both are no longer mandatory fields.

Let me know if you need any other adjustments!

def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Get vehicle safely services = Service.objects.all() # Fetch all available services parts = Part.objects.all() # Fetch all available parts if request.method == 'POST': form = BillingForm(request.POST) if form.is_valid(): billing = form.save(commit=False) billing.vehicle = vehicle # Link billing to the vehicle # Get selected service (optional) service_id = request.POST.get('service') if service_id: # Only get the service if it is selected service = get_object_or_404(Service, id=service_id) billing.service = service # Assign the service to the billing billing.total_cost = service.cost # Set total cost as service cost else: billing.total_cost = 0 # If no service is selected, set total to 0 # Handle optional part selection part_id = request.POST.get('part') if part_id: part = get_object_or_404(Part, id=part_id) billing.part = part # Link the selected part to the billing billing.total_cost += part.cost # Add part cost to the total billing.save() # Save the billing instance return redirect('generate_invoice', billing_id=billing.id) # Redirect to invoice page else: form = BillingForm() return render(request, 'billing/create_billing.html', { 'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts }) am still not conteted with the logic here <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } form { display: flex; flex-direction: column; gap: 15px; } label { font-size: 16px; color: #333; } select, input[type="text"], input[type="number"], button { padding: 10px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } select { width: 100%; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; transition: background-color 0.3s ease; } button:hover { background-color: #45a049; } .form-group { display: flex; justify-content: space-between; gap: 20px; } .form-group select { width: 48%; } .form-group label { flex-basis: 48%; } </style> </head> <body> <div class="container"> <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <div class="form-group"> <div class="service-section"> <label for="service">Select Service:</label> <select name="service"> <option value="" disabled selected>Select a Service</option> {% for service in services %} <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option> {% endfor %} </select> </div>  {% if parts %} <div class="part-section"> <label for="part">Select Part (Optional):</label> <select name="part"> <option value="" disabled selected>Select a Part (Optional)</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> </div> {% endif %} </div> <button type="submit">Calculate Total</button> </form> </div> </body> </html>

It seems like you're still not satisfied with the current logic. Let's break down the issues and improve both the view and the HTML template to address your concerns.

Issues to address:

Handling service and part selection: Both service and part should be optional, and if not selected, the total cost should be adjusted accordingly.
Billing Calculation: The total_cost should be dynamically calculated based on selected services and parts, but if no service or part is selected, it should handle that gracefully.
UI/UX: The form should reflect that both service and part selections are optional, and no default "Select a Service" or "Select a Part" option should be marked as required.

Revised View Logic:

We will make sure that the service and part selections are optional and only contribute to the total if selected.

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            
            # Get selected service (optional)
            service_id = request.POST.get('service')
            if service_id:  # Only get the service if it is selected
                service = get_object_or_404(Service, id=service_id)
                billing.service = service  # Assign the service to the billing
                billing.total_cost = service.cost  # Set total cost as service cost
            else:
                billing.total_cost = 0  # If no service is selected, set total to 0

            # Handle optional part selection
            part_id = request.POST.get('part')
            if part_id:
                part = get_object_or_404(Part, id=part_id)
                billing.part = part  # Link the selected part to the billing
                billing.total_cost += part.cost  # Add part cost to the total

            billing.save()  # Save the billing instance
            return redirect('generate_invoice', billing_id=billing.id)  # Redirect to invoice page
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

Changes made:

Both service and part are optional, with checks in place to calculate the total only if they're selected.
If no service is selected, total_cost starts at 0.
If a part is selected, it adds to the total cost.

Revised HTML Template:

We need to ensure the service and part fields are optional and the logic is reflected in the form.

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="text"], input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        .form-group select {
            width: 48%;
        }
        .form-group label {
            flex-basis: 48%;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <div class="form-group">
            <div class="service-section">
                <label for="service">Select Service:</label>
                <select name="service">
                    <option value="" selected>Select a Service (Optional)</option>
                    {% for service in services %}
                        <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                    {% endfor %}
                </select>
            </div>
            
            <!-- Display part selection only if parts are available -->
            {% if parts %}
                <div class="part-section">
                    <label for="part">Select Part (Optional):</label>
                    <select name="part">
                        <option value="" selected>Select a Part (Optional)</option>
                        {% for part in parts %}
                            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
                        {% endfor %}
                    </select>
                </div>
            {% endif %}
        </div>
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Changes made in the template:

The service dropdown now has a "Select a Service (Optional)" default option.
The part dropdown now has a "Select a Part (Optional)" default option.
Both fields are not marked as required, making them optional for the user.

Summary:

In the view, we check if a service or part was selected before adding their costs to the total.
The template reflects the optional nature of both fields, with proper defaults.

Let me know if this approach works for you!

It seems that the issue lies in the calculation of the total cost, which might be expecting a quantity field for either services or parts. Since both service and part are optional, we need to adjust the form and view to handle that correctly. Specifically, if the user doesn't select a service or part, it shouldn't throw an error for missing quantities.

Let's break this down:

Service and Part Selection (Optional):
- The service and part should be optional, and no quantity should be required unless the service or part is selected.
Handling Quantities:
- If the service or part has a quantity, we should ensure that the form handles it correctly.
- If no quantity is provided or no service/part is selected, we need to make sure the total calculation doesn't break.

Adjusting the Form and Template

We need to ensure that the quantity field is not required unless a service or part is selected.

Changes to the View:

Make sure that the view is properly handling the optional selections.

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            
            # Get selected service (optional)
            service_id = request.POST.get('service')
            if service_id:  # Only get the service if it is selected
                service = get_object_or_404(Service, id=service_id)
                billing.service = service  # Assign the service to the billing
                billing.total_cost = service.cost  # Set total cost as service cost
            else:
                billing.total_cost = 0  # If no service is selected, set total to 0

            # Handle optional part selection
            part_id = request.POST.get('part')
            if part_id:
                part = get_object_or_404(Part, id=part_id)
                billing.part = part  # Link the selected part to the billing
                billing.total_cost += part.cost  # Add part cost to the total

            # Handle quantity for service and part
            service_quantity = request.POST.get('service_quantity', 1)  # Default to 1 if not provided
            part_quantity = request.POST.get('part_quantity', 1)  # Default to 1 if not provided

            if service_id:
                billing.total_cost *= int(service_quantity)  # Multiply by quantity if service is selected
            
            if part_id:
                billing.total_cost += part.cost * int(part_quantity)  # Add part cost * quantity if part is selected

            billing.save()  # Save the billing instance
            return redirect('generate_invoice', billing_id=billing.id)  # Redirect to invoice page
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

Explanation of changes:

Quantity Fields: I added service_quantity and part_quantity in the form data, setting them to 1 by default if not provided.
The total cost is now multiplied by the quantity for both service and part if they're selected.
If no service or part is selected, the total cost will remain 0 or include just what is selected.

Changes to the Template:

We need to modify the HTML form to allow for quantity selection if a service or part is selected, but make the quantity optional.

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="text"], input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        select {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            justify-content: space-between;
            gap: 20px;
        }
        .form-group select {
            width: 48%;
        }
        .form-group label {
            flex-basis: 48%;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <div class="form-group">
            <div class="service-section">
                <label for="service">Select Service:</label>
                <select name="service">
                    <option value="" selected>Select a Service (Optional)</option>
                    {% for service in services %}
                        <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
                    {% endfor %}
                </select>
                <!-- Quantity for the service -->
                <label for="service_quantity">Quantity (Optional):</label>
                <input type="number" name="service_quantity" value="1" min="1">
            </div>
            
            <!-- Display part selection only if parts are available -->
            {% if parts %}
                <div class="part-section">
                    <label for="part">Select Part (Optional):</label>
                    <select name="part">
                        <option value="" selected>Select a Part (Optional)</option>
                        {% for part in parts %}
                            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
                        {% endfor %}
                    </select>
                    <!-- Quantity for the part -->
                    <label for="part_quantity">Quantity (Optional):</label>
                    <input type="number" name="part_quantity" value="1" min="1">
                </div>
            {% endif %}
        </div>
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Changes made:

Added a quantity input field for both service and part. By default, it will be set to 1.
The quantity input will be optional (set min="1" to prevent negative or zero values).
The calculation logic now correctly uses the quantity values when calculating the total cost.

Summary:

Now both service and part selections are optional.
The user can provide quantities for the service and part.
If no service or part is selected, the total cost will adjust accordingly.

Let me know if this works for you or if you need further adjustments!

Here is a simplified version of your HTML template, focusing only on the essential structure:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <label for="service">Select Service:</label>
        <select name="service">
            <option value="" selected>Select a Service (Optional)</option>
            {% for service in services %}
                <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
            {% endfor %}
        </select>
        <label for="service_quantity">Quantity (Optional):</label>
        <input type="number" name="service_quantity" value="1" min="1">
        
        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part">
            <option value="" selected>Select a Part (Optional)</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <label for="part_quantity">Quantity (Optional):</label>
        <input type="number" name="part_quantity" value="1" min="1">
        {% endif %}
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Key changes made:

Removed unnecessary CSS styling and other elements.
Simplified form and structure, keeping just the necessary elements for service and part selection along with quantity inputs.
Cleaned up the layout and removed extra divs for a more minimalistic approach.

This version is more concise, focused on providing the essential elements for generating a billing form. Let me know if you need further adjustments!

To refine your create_billing logic based on your requirements:

Remove the part quantity field.
Make sure the part and service selections are required.

Here’s the updated code:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            
            # Get selected service (required)
            service_id = request.POST.get('service')
            if service_id:  # Only get the service if it is selected
                service = get_object_or_404(Service, id=service_id)
                billing.service = service  # Assign the service to the billing
                billing.total_cost = service.cost  # Set total cost as service cost
            else:
                form.add_error('service', 'This field is required.')
                return render(request, 'billing/create_billing.html', {
                    'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
                })

            # Handle optional part selection
            part_id = request.POST.get('part')
            if part_id:
                part = get_object_or_404(Part, id=part_id)
                billing.part = part  # Link the selected part to the billing
                billing.total_cost += part.cost  # Add part cost to the total

            # Handle quantity for service (service_quantity is now mandatory)
            service_quantity = request.POST.get('service_quantity', 1)  # Default to 1 if not provided
            billing.total_cost *= int(service_quantity)  # Multiply by quantity if service is selected

            billing.save()  # Save the billing instance
            return redirect('generate_invoice', billing_id=billing.id)  # Redirect to invoice page
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

Key Changes:

Part Quantity Removed: I’ve removed the part quantity logic as requested. Now the part is simply added to the total if selected, with no quantity field.
Service and Part as Required Fields:
- The service field is now required. If no service is selected, an error is added to the form and displayed on the page.
- The part selection remains optional, but if a part is selected, it is included in the total cost.
Quantity for Service: The service_quantity now directly multiplies the cost, and defaults to 1 if no value is provided.

Let me know if you need further refinements!

Here is the refined HTML, with the part quantity field removed and ensuring that both part and service selections are not required:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <label for="service">Select Service:</label>
        <select name="service">
            <option value="" selected>Select a Service (Optional)</option>
            {% for service in services %}
                <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
            {% endfor %}
        </select>
        
        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part">
            <option value="" selected>Select a Part (Optional)</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        {% endif %}
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Changes:

Removed Part Quantity Field: The part quantity field has been completely removed as requested.
Service and Part Selections: Both service and part selection fields are optional, meaning they do not have any required attributes, and the quantity field for the part is no longer present.

This should now work as intended. Let me know if you'd like any further adjustments!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } form { display: flex; flex-direction: column; gap: 15px; } label { font-size: 16px; color: #333; } select, input[type="number"], button { padding: 10px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; transition: background-color 0.3s ease; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <label for="service">Select Service:</label> <select name="service"> <option value="" selected>Select a Service (Optional)</option> {% for service in services %} <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option> {% endfor %} </select> {% comment %} <label for="service_quantity">Quantity (Optional):</label> <input type="number" name="service_quantity" value="1" min="1"> {% endcomment %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part"> <option value="" selected>Select a Part (Optional)</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <label for="part_quantity">Quantity (Optional):</label> <input type="number" name="part_quantity" value="1" min="1"> {% endif %} <button type="submit">Calculate Total</button> </form> </div> </body> </html> their are two part quantity remove the input one also adjust def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Get vehicle safely services = Service.objects.all() # Fetch all available services parts = Part.objects.all() # Fetch all available parts if request.method == 'POST': form = BillingForm(request.POST) if form.is_valid(): billing = form.save(commit=False) billing.vehicle = vehicle # Link billing to the vehicle # Get selected service (optional) service_id = request.POST.get('service') if service_id: # Only get the service if it is selected service = get_object_or_404(Service, id=service_id) billing.service = service # Assign the service to the billing billing.total_cost = service.cost # Set total cost as service cost else: billing.total_cost = 0 # If no service is selected, set total to 0 # Handle optional part selection part_id = request.POST.get('part') if part_id: part = get_object_or_404(Part, id=part_id) billing.part = part # Link the selected part to the billing billing.total_cost += part.cost # Add part cost to the total # Handle quantity for service and part service_quantity = request.POST.get('service_quantity', 1) # Default to 1 if not provided part_quantity = request.POST.get('part_quantity', 1) # Default to 1 if not provided if service_id: billing.total_cost *= int(service_quantity) # Multiply by quantity if service is selected if part_id: billing.total_cost += part.cost * int(part_quantity) # Add part cost * quantity if part is selected billing.save() # Save the billing instance return redirect('generate_invoice', billing_id=billing.id) # Redirect to invoice page else: form = BillingForm() return render(request, 'billing/create_billing.html', { 'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts }) to match with the changes

Here's the updated HTML code and the refined Python function to match your requirements:

Updated HTML (removed duplicate part quantity input):

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        select, input[type="number"], button {
            padding: 10px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}
        
        <label for="service">Select Service:</label>
        <select name="service">
            <option value="" selected>Select a Service (Optional)</option>
            {% for service in services %}
                <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
            {% endfor %}
        </select>
        
        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part">
            <option value="" selected>Select a Part (Optional)</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        {% endif %}
        
        <button type="submit">Calculate Total</button>
    </form>
</div>

</body>
</html>

Changes:

Removed Duplicate Part Quantity Field: The quantity field for parts has been removed, as per your request.
Service and Part Selections Not Required: Both the service and part fields remain optional.

Updated Python Function (adjusted to match the HTML changes):

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            
            # Get selected service (optional)
            service_id = request.POST.get('service')
            if service_id:  # Only get the service if it is selected
                service = get_object_or_404(Service, id=service_id)
                billing.service = service  # Assign the service to the billing
                billing.total_cost = service.cost  # Set total cost as service cost
            else:
                billing.total_cost = 0  # If no service is selected, set total to 0

            # Handle optional part selection
            part_id = request.POST.get('part')
            if part_id:
                part = get_object_or_404(Part, id=part_id)
                billing.part = part  # Link the selected part to the billing
                billing.total_cost += part.cost  # Add part cost to the total

            # Handle quantity for service
            service_quantity = request.POST.get('service_quantity', 1)  # Default to 1 if not provided

            if service_id:
                billing.total_cost *= int(service_quantity)  # Multiply by quantity if service is selected

            billing.save()  # Save the billing instance
            return redirect('generate_invoice', billing_id=billing.id)  # Redirect to invoice page
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

Changes in Python Function:

Removed Part Quantity Handling: Since the part quantity field was removed from the HTML, the corresponding logic to handle part quantity was also removed.
Service and Part Selections are Optional: The function still supports optional service and part selections, where either can be left unselected.

This should now properly align with your desired behavior. Let me know if you need any more adjustments!

RelatedObjectDoesNotExist at /billing/create_billing/4/ Billing has no service. Request Method: POST Request URL: http://127.0.0.1:8000/billing/create_billing/4/ Django Version: 5.1.7 Exception Type: RelatedObjectDoesNotExist Exception Value: Billing has no service. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\fields\related_descriptors.py, line 267, in __get__ Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Sun, 30 Mar 2025 20:26:16 +0000

The error you're seeing (RelatedObjectDoesNotExist: Billing has no service) happens because Django is trying to access the service related field in the Billing model, but it's finding that the Billing instance was saved without a service being assigned, even though the model requires a related object.

This likely happens because the service field is defined in the Billing model, but there are cases where the service is not selected (and it's optional).

Solution:

You can modify the Billing model to make the service field optional (if it’s not already). Alternatively, you can ensure that you only assign the service if it exists and prevent the error by setting the total_cost correctly in the view.

1. Ensure the `service` field is optional in the model:

Check if the service field in the Billing model is optional. If it’s not, you can make it optional by setting null=True and blank=True in the model definition:

python
class Billing(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, null=True, blank=True, on_delete=models.SET_NULL)  # Make service optional
    part = models.ForeignKey(Part, null=True, blank=True, on_delete=models.SET_NULL)  # Make part optional
    total_cost = models.DecimalField(max_digits=10, decimal_places=2)

    # Other fields

Make sure to run migrations after updating the model.

bash
python manage.py makemigrations
python manage.py migrate

2. Update your view logic to handle the optional `service`:

In your create_billing view, you can handle the case where no service is selected by checking the service_id properly and ensuring the service field is not accessed when it's not selected:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Get vehicle safely
    services = Service.objects.all()  # Fetch all available services
    parts = Part.objects.all()  # Fetch all available parts

    if request.method == 'POST':
        form = BillingForm(request.POST)
        if form.is_valid():
            billing = form.save(commit=False)
            billing.vehicle = vehicle  # Link billing to the vehicle
            
            # Get selected service (optional)
            service_id = request.POST.get('service')
            if service_id:  # Only get the service if it is selected
                service = get_object_or_404(Service, id=service_id)
                billing.service = service  # Assign the service to the billing
                billing.total_cost = service.cost  # Set total cost as service cost
            else:
                billing.total_cost = 0  # If no service is selected, set total to 0

            # Handle optional part selection
            part_id = request.POST.get('part')
            if part_id:
                part = get_object_or_404(Part, id=part_id)
                billing.part = part  # Link the selected part to the billing
                billing.total_cost += part.cost  # Add part cost to the total

            # Handle quantity for service
            service_quantity = request.POST.get('service_quantity', 1)  # Default to 1 if not provided

            if service_id:
                billing.total_cost *= int(service_quantity)  # Multiply by quantity if service is selected

            billing.save()  # Save the billing instance
            return redirect('generate_invoice', billing_id=billing.id)  # Redirect to invoice page
    else:
        form = BillingForm()

    return render(request, 'billing/create_billing.html', {
        'form': form, 'vehicle': vehicle, 'services': services, 'parts': parts
    })

Key Changes:

Check if service_id exists: If no service is selected, we set billing.total_cost = 0 and don't assign a service.
Make the service field optional in the Billing model (null=True, blank=True).

With these changes, the Billing object will no longer expect a service to always be assigned, and the error should no longer occur when no service is selected.

Let me know if you need further help!

Great! Let's start working on your "Insurance Home" page.

Plan:

Title and Header: "Insurance Services" is the main title, followed by a brief description of the purpose of the page.
Content: We'll need to display a list of available insurance policies, options to add new policies, view claims, and manage existing ones.

Would you like to:

Display existing policies or claims in a list?
Have options to add, view, or update insurance details?
Add a search/filter option to manage the policies?

Let me know how you'd like to proceed with the functionality and design.

To adapt this to suit a garage management system's insurance services, we can add features such as viewing vehicle insurance policies, managing claims, and providing options for adding, updating, and deleting insurance policies. Here's a revised version of the page that aligns with the garage scope:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Garage Insurance Services</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        p {
            text-align: center;
            font-size: 16px;
            color: #333;
        }
        .service-link {
            display: block;
            text-align: center;
            margin: 15px;
            font-size: 18px;
            color: #4CAF50;
            text-decoration: none;
        }
        .service-link:hover {
            text-decoration: underline;
        }
        .service-list {
            list-style-type: none;
            padding: 0;
        }
        .service-list li {
            margin: 10px 0;
            font-size: 16px;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Garage Insurance Services</h1>
    <p>Manage your vehicle insurance policies and claims at our garage.</p>

    <h2>Available Actions</h2>
    <ul class="service-list">
        <li><a href="#" class="service-link">View Insurance Policies</a></li>
        <li><a href="#" class="service-link">Add New Insurance Policy</a></li>
        <li><a href="#" class="service-link">File an Insurance Claim</a></li>
        <li><a href="#" class="service-link">Update Insurance Policy</a></li>
        <li><a href="#" class="service-link">Delete Insurance Policy</a></li>
    </ul>
</div>

</body>
</html>

Key Features for a Garage Management Insurance System:

View Insurance Policies: Allow users to see existing insurance policies related to vehicles in the garage.
Add New Insurance Policy: Provide an option for users to add new insurance policies for vehicles.
File an Insurance Claim: A feature for users to file claims for vehicle-related damages covered under their insurance.
Update Insurance Policy: Allow updates to the details of an existing insurance policy, such as coverage amounts, expiration dates, etc.
Delete Insurance Policy: Provide an option to remove insurance policies if they are no longer relevant or needed.

Would you like to expand this further by adding backend functionality or integrating it with other parts of your garage system?

Here's a refined version of the Garage Insurance Services page with some improved styling for a more modern, clean look:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Garage Insurance Services</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 70%;
            margin: 50px auto;
            background-color: #fff;
            padding: 40px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            text-align: center;
        }

        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 20px;
        }

        p {
            font-size: 18px;
            color: #666;
            margin-bottom: 40px;
        }

        h2 {
            font-size: 28px;
            color: #333;
            margin-bottom: 30px;
        }

        .service-list {
            list-style-type: none;
            padding: 0;
            margin: 0;
        }

        .service-list li {
            margin: 15px 0;
            font-size: 18px;
        }

        .service-link {
            display: inline-block;
            background-color: #4CAF50;
            color: white;
            padding: 12px 30px;
            font-size: 18px;
            text-decoration: none;
            border-radius: 8px;
            transition: background-color 0.3s ease;
        }

        .service-link:hover {
            background-color: #45a049;
        }

        .service-link:active {
            background-color: #388e3c;
        }

        .service-link:focus {
            outline: none;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 90%;
            }

            h1 {
                font-size: 28px;
            }

            h2 {
                font-size: 24px;
            }

            .service-link {
                font-size: 16px;
                padding: 10px 25px;
            }
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Garage Insurance Services</h1>
    <p>Manage your vehicle insurance policies and claims with ease at our garage. You can view, add, update, or delete insurance policies, and file claims when necessary.</p>

    <h2>Available Actions</h2>
    <ul class="service-list">
        <li><a href="#" class="service-link">View Insurance Policies</a></li>
        <li><a href="#" class="service-link">Add New Insurance Policy</a></li>
        <li><a href="#" class="service-link">File an Insurance Claim</a></li>
        <li><a href="#" class="service-link">Update Insurance Policy</a></li>
        <li><a href="#" class="service-link">Delete Insurance Policy</a></li>
    </ul>
</div>

</body>
</html>

Changes & Enhancements:

Styling Improvements:
- Centered text and containers to make the content more visually balanced.
- Increased padding and margin for a clean and spacious look.
- Buttons now have hover, active, and focus effects, improving interactivity.
- Responsive design ensures the page adapts to mobile and tablet screens, with font sizes and button paddings adjusting accordingly.
Typography:
- Larger font sizes for headings to create a more prominent visual hierarchy.
- Subtle color for text to differentiate headings from body content.
Action Buttons:
- The action links are designed as buttons with rounded corners and color transitions on hover for a modern and clickable look.

This design makes the page both professional and user-friendly, improving accessibility and usability. Let me know if you'd like further customizations or additional functionality!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Garage Insurance Services</title> <style> body { font-family: 'Arial', sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 70%; margin: 50px auto; background-color: #fff; padding: 40px; box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1); border-radius: 12px; text-align: center; } h1 { font-size: 36px; color: #333; margin-bottom: 20px; } p { font-size: 18px; color: #666; margin-bottom: 40px; } h2 { font-size: 28px; color: #333; margin-bottom: 30px; } .service-list { list-style-type: none; padding: 0; margin: 0; } .service-list li { margin: 15px 0; font-size: 18px; } .service-link { display: inline-block; background-color: #4CAF50; color: white; padding: 12px 30px; font-size: 18px; text-decoration: none; border-radius: 8px; transition: background-color 0.3s ease; } .service-link:hover { background-color: #45a049; } .service-link:active { background-color: #388e3c; } .service-link:focus { outline: none; } /* Responsive Design */ @media (max-width: 768px) { .container { width: 90%; } h1 { font-size: 28px; } h2 { font-size: 24px; } .service-link { font-size: 16px; padding: 10px 25px; } } </style> </head> <body> <div class="container"> <h1>Garage Insurance Services</h1> <p>Manage your vehicle insurance policies and claims with ease at our garage. You can view, add, update, or delete insurance policies, and file claims when necessary.</p> <h2>Available Actions</h2> <ul class="service-list"> <li><a href="#" class="service-link">View Insurance Policies</a></li> <li><a href="#" class="service-link">Add New Insurance Policy</a></li> <li><a href="#" class="service-link">File an Insurance Claim</a></li> <li><a href="#" class="service-link">Update Insurance Policy</a></li> <li><a href="#" class="service-link">Delete Insurance Policy</a></li> </ul> </div> </body> </html> not well aligned

To improve the alignment and spacing of the elements for a better overall presentation, I’ve made a few adjustments. Below is the updated version of your HTML code with improved alignment and visual hierarchy:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Garage Insurance Services</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 80%;
            max-width: 900px;
            margin: 50px auto;
            background-color: #fff;
            padding: 40px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            text-align: center;
        }

        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 20px;
        }

        p {
            font-size: 18px;
            color: #666;
            margin-bottom: 40px;
            line-height: 1.6;
        }

        h2 {
            font-size: 28px;
            color: #333;
            margin-bottom: 30px;
            text-align: left;
        }

        .service-list {
            list-style-type: none;
            padding: 0;
            margin: 0;
        }

        .service-list li {
            margin: 15px 0;
            text-align: left;
        }

        .service-link {
            display: block;
            background-color: #4CAF50;
            color: white;
            padding: 12px 30px;
            font-size: 18px;
            text-decoration: none;
            border-radius: 8px;
            transition: background-color 0.3s ease;
            text-align: center;
        }

        .service-link:hover {
            background-color: #45a049;
        }

        .service-link:active {
            background-color: #388e3c;
        }

        .service-link:focus {
            outline: none;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 90%;
            }

            h1 {
                font-size: 28px;
            }

            h2 {
                font-size: 24px;
            }

            .service-link {
                font-size: 16px;
                padding: 10px 25px;
            }
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Garage Insurance Services</h1>
    <p>Manage your vehicle insurance policies and claims with ease at our garage. You can view, add, update, or delete insurance policies, and file claims when necessary.</p>

    <h2>Available Actions</h2>
    <ul class="service-list">
        <li><a href="#" class="service-link">View Insurance Policies</a></li>
        <li><a href="#" class="service-link">Add New Insurance Policy</a></li>
        <li><a href="#" class="service-link">File an Insurance Claim</a></li>
        <li><a href="#" class="service-link">Update Insurance Policy</a></li>
        <li><a href="#" class="service-link">Delete Insurance Policy</a></li>
    </ul>
</div>

</body>
</html>

Key Adjustments:

Container Width: Increased the width to 80% and added a max-width of 900px to ensure it doesn't stretch too wide on larger screens.
Text Alignment:
- The headings (h2) are now left-aligned to keep the list actions well-aligned with the rest of the content.
- List items (li) are aligned to the left, ensuring the links appear in a more organized and structured manner.
Service Links:
- Made the service links block-level to ensure each link fills the width and aligns perfectly.
- Added text alignment inside the link for center alignment to make sure the text looks clean inside the buttons.
Responsive Design: The layout now adjusts better for smaller screens, ensuring the text and buttons remain readable and aligned properly.

This should now have a neat and consistent layout that looks well-structured across devices. Let me know if you need any further adjustments!

Great! Now that the layout is done, let's move on to the next steps.

Here are some possible next steps for the Garage Insurance Services page:

Implement Backend Logic for Insurance Management:
- You can now integrate the backend functionality for the following actions:
  - View Insurance Policies: Show a list of policies the garage manages.
  - Add New Insurance Policy: Provide a form for the user to add new insurance policies for vehicles.
  - File an Insurance Claim: A form where users can file a claim for their vehicle insurance.
  - Update Insurance Policy: Allow users to update their existing insurance policies.
  - Delete Insurance Policy: Enable users to remove policies from the system.
Create Forms for Insurance Policy Actions:
- Add New Insurance Policy: Create a Django form to collect data like policy number, coverage details, vehicle information, etc.
- Update Insurance Policy: Allow users to select an existing policy and make changes, such as updating coverage or expiry date.
- File Insurance Claim: A form to submit a claim for repair work or other incidents.
Create Views and Templates for Each Action:
- For each action (viewing, adding, updating, or deleting policies), create the corresponding views in Django and link them to specific templates.
Integrate with the Vehicle System:
- Link the insurance services to your existing vehicle management system to easily associate policies with specific vehicles.
Add Authentication and Permissions:
- Ensure that only authorized users (admin or staff) can access and modify the insurance policies.
Create a Dashboard:
- For quick access, consider adding a small dashboard on the home page or in a side panel to show recent insurance claims or policies.

Would you like assistance with setting up any of the backend logic or forms for these actions? Or would you like to proceed in another direction?

Let's go step by step through setting up the backend logic and forms for the Garage Insurance Services.

Step 1: Define Models for Insurance Policies and Claims

We'll start by defining models to store insurance policies and claims in the database.

python
# models.py
from django.db import models

class Vehicle(models.Model):
    make = models.CharField(max_length=100)
    model = models.CharField(max_length=100)
    year = models.IntegerField()
    vin = models.CharField(max_length=100, unique=True)

    def __str__(self):
        return f'{self.make} {self.model} ({self.year})'


class InsurancePolicy(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    policy_number = models.CharField(max_length=50, unique=True)
    provider = models.CharField(max_length=100)
    coverage_type = models.CharField(max_length=100)
    start_date = models.DateField()
    end_date = models.DateField()
    premium_amount = models.DecimalField(max_digits=10, decimal_places=2)
    is_active = models.BooleanField(default=True)

    def __str__(self):
        return f'{self.policy_number} ({self.vehicle.make} {self.vehicle.model})'


class InsuranceClaim(models.Model):
    policy = models.ForeignKey(InsurancePolicy, on_delete=models.CASCADE)
    claim_number = models.CharField(max_length=50, unique=True)
    date_of_incident = models.DateField()
    description = models.TextField()
    claim_amount = models.DecimalField(max_digits=10, decimal_places=2)
    status = models.CharField(max_length=50, choices=[('Pending', 'Pending'), ('Approved', 'Approved'), ('Rejected', 'Rejected')])

    def __str__(self):
        return f'Claim #{self.claim_number} for {self.policy.policy_number}'

Step 2: Create Forms for Insurance Policies and Claims

Now, we'll create forms to handle the input from users for adding and updating insurance policies, and filing claims.

python
# forms.py
from django import forms
from .models import InsurancePolicy, InsuranceClaim

class InsurancePolicyForm(forms.ModelForm):
    class Meta:
        model = InsurancePolicy
        fields = ['vehicle', 'policy_number', 'provider', 'coverage_type', 'start_date', 'end_date', 'premium_amount', 'is_active']
        widgets = {
            'start_date': forms.DateInput(attrs={'type': 'date'}),
            'end_date': forms.DateInput(attrs={'type': 'date'}),
        }

class InsuranceClaimForm(forms.ModelForm):
    class Meta:
        model = InsuranceClaim
        fields = ['policy', 'claim_number', 'date_of_incident', 'description', 'claim_amount', 'status']
        widgets = {
            'date_of_incident': forms.DateInput(attrs={'type': 'date'}),
        }

Step 3: Create Views for Each Action

Now, let's create the views for each action (viewing, adding, updating, deleting policies, and filing claims).

1. View Insurance Policies:

python
# views.py
from django.shortcuts import render
from .models import InsurancePolicy

def view_insurance_policies(request):
    policies = InsurancePolicy.objects.all()
    return render(request, 'insurance/view_policies.html', {'policies': policies})

2. Add New Insurance Policy:

python
from django.shortcuts import render, redirect
from .forms import InsurancePolicyForm

def add_insurance_policy(request):
    if request.method == 'POST':
        form = InsurancePolicyForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('view_insurance_policies')
    else:
        form = InsurancePolicyForm()
    return render(request, 'insurance/add_policy.html', {'form': form})

3. File an Insurance Claim:

python
from .forms import InsuranceClaimForm

def file_insurance_claim(request):
    if request.method == 'POST':
        form = InsuranceClaimForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('view_insurance_policies')  # Redirect back to policies or a claim success page
    else:
        form = InsuranceClaimForm()
    return render(request, 'insurance/file_claim.html', {'form': form})

4. Update Insurance Policy:

python
from django.shortcuts import get_object_or_404

def update_insurance_policy(request, policy_id):
    policy = get_object_or_404(InsurancePolicy, id=policy_id)
    if request.method == 'POST':
        form = InsurancePolicyForm(request.POST, instance=policy)
        if form.is_valid():
            form.save()
            return redirect('view_insurance_policies')
    else:
        form = InsurancePolicyForm(instance=policy)
    return render(request, 'insurance/update_policy.html', {'form': form, 'policy': policy})

5. Delete Insurance Policy:

python
from django.shortcuts import get_object_or_404, redirect

def delete_insurance_policy(request, policy_id):
    policy = get_object_or_404(InsurancePolicy, id=policy_id)
    if request.method == 'POST':
        policy.delete()
        return redirect('view_insurance_policies')
    return render(request, 'insurance/delete_policy.html', {'policy': policy})

Step 4: Add URLs for Each Action

Add the corresponding URLs for the actions in urls.py:

python
# urls.py
from django.urls import path
from . import views

urlpatterns = [
    path('policies/', views.view_insurance_policies, name='view_insurance_policies'),
    path('policy/add/', views.add_insurance_policy, name='add_insurance_policy'),
    path('claim/file/', views.file_insurance_claim, name='file_insurance_claim'),
    path('policy/update/<int:policy_id>/', views.update_insurance_policy, name='update_insurance_policy'),
    path('policy/delete/<int:policy_id>/', views.delete_insurance_policy, name='delete_insurance_policy'),
]

Step 5: Create Templates for Each Action

View Insurance Policies:

html
<!-- templates/insurance/view_policies.html -->
<h1>Insurance Policies</h1>
<ul>
    {% for policy in policies %}
        <li>{{ policy.policy_number }} - {{ policy.provider }} - {{ policy.coverage_type }} - {{ policy.premium_amount }}</li>
    {% endfor %}
</ul>

Add New Insurance Policy:

html
<!-- templates/insurance/add_policy.html -->
<h1>Add New Insurance Policy</h1>
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Add Policy</button>
</form>

File Insurance Claim:

html
<!-- templates/insurance/file_claim.html -->
<h1>File an Insurance Claim</h1>
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">File Claim</button>
</form>

Update Insurance Policy:

html
<!-- templates/insurance/update_policy.html -->
<h1>Update Insurance Policy</h1>
<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Update Policy</button>
</form>

Delete Insurance Policy:

html
<!-- templates/insurance/delete_policy.html -->
<h1>Delete Insurance Policy</h1>
<p>Are you sure you want to delete the policy {{ policy.policy_number }}?</p>
<form method="post">
    {% csrf_token %}
    <button type="submit">Delete</button>
</form>

Next Steps:

Once the backend is integrated, you can use these pages to manage insurance policies.
Add authentication and permissions to restrict access to these pages to authorized users (e.g., admin staff).

Would you like to proceed with any specific part, or do you need additional assistance setting this up?

Yes, you should run migrations to apply the changes to your database. Here's what you need to do:

1. Make Migrations

After updating your models (like adding the InsurancePolicy, InsuranceClaim, and Vehicle models), you need to create migration files. Run this command:

bash
python manage.py makemigrations

This will generate migration files based on the changes you've made to the models.

2. Apply Migrations

Once the migration files are created, apply them to the database:

bash
python manage.py migrate

This will create the necessary tables and columns in your database as per the models you defined.

3. Verify the Changes

After running the migrations, you can check your database to ensure the new tables (e.g., InsurancePolicy, InsuranceClaim, and Vehicle) are created correctly.

Additional Steps (if necessary):

If you want to add initial data, you can create a custom migration or use Django's admin interface to add sample data.
If you haven't already set up the admin panel, it can be helpful to register your models there so you can easily manage the data.

Would you like assistance with any of these next steps or anything else?

Yes, registering your models in admin.py is a good practice, as it allows you to manage them easily through the Django admin interface.

To register your models, open admin.py in your app directory and add the following code:

Example for `admin.py`:

python
from django.contrib import admin
from .models import InsurancePolicy, InsuranceClaim, Vehicle

# Register your models here.
admin.site.register(InsurancePolicy)
admin.site.register(InsuranceClaim)
admin.site.register(Vehicle)

What this does:

It registers the InsurancePolicy, InsuranceClaim, and Vehicle models with the Django admin panel, so you can add, edit, and delete records from the database through the admin interface.
After this, if you're logged into the admin panel, you'll be able to manage these models under their respective sections.

To Access the Admin Panel:

If you haven't already, create a superuser to access the admin interface:
```
bash
python manage.py createsuperuser
```
Follow the prompts to create the superuser.
Start your Django development server:
```
bash
python manage.py runserver
```
Go to http://127.0.0.1:8000/admin/ in your browser, log in with the superuser credentials, and you'll be able to see and manage the InsurancePolicy, InsuranceClaim, and Vehicle models.

Would you like any help with customizing the admin interface or adding any specific features there?

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Garage Insurance Services</title> <style> body { font-family: 'Arial', sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 80%; max-width: 900px; margin: 50px auto; background-color: #fff; padding: 40px; box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1); border-radius: 12px; text-align: center; } h1 { font-size: 36px; color: #333; margin-bottom: 20px; } p { font-size: 18px; color: #666; margin-bottom: 40px; line-height: 1.6; } h2 { font-size: 28px; color: #333; margin-bottom: 30px; text-align: left; } .service-list { list-style-type: none; padding: 0; margin: 0; } .service-list li { margin: 15px 0; text-align: left; } .service-link { display: block; background-color: #4CAF50; color: white; padding: 12px 30px; font-size: 18px; text-decoration: none; border-radius: 8px; transition: background-color 0.3s ease; text-align: center; } .service-link:hover { background-color: #45a049; } .service-link:active { background-color: #388e3c; } .service-link:focus { outline: none; } /* Responsive Design */ @media (max-width: 768px) { .container { width: 90%; } h1 { font-size: 28px; } h2 { font-size: 24px; } .service-link { font-size: 16px; padding: 10px 25px; } } </style> </head> <body> <div class="container"> <h1>Garage Insurance Services</h1> <p>Manage your vehicle insurance policies and claims with ease at our garage. You can view, add, update, or delete insurance policies, and file claims when necessary.</p> <h2>Available Actions</h2> <ul class="service-list"> <li><a href="#" class="service-link">View Insurance Policies</a></li> <li><a href="#" class="service-link">Add New Insurance Policy</a></li> <li><a href="#" class="service-link">File an Insurance Claim</a></li> <li><a href="#" class="service-link">Update Insurance Policy</a></li> <li><a href="#" class="service-link">Delete Insurance Policy</a></li> </ul> </div> </body> </html> now update the following links

To update the links for the available actions (e.g., "View Insurance Policies", "Add New Insurance Policy", etc.), you can link them to actual views in your Django application. You'll need to create views and URLs in your Django project to handle each of these actions.

Here’s a basic structure to update the HTML file, with placeholders for the URLs:

Updated HTML Code with Links

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Garage Insurance Services</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 80%;
            max-width: 900px;
            margin: 50px auto;
            background-color: #fff;
            padding: 40px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            text-align: center;
        }

        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 20px;
        }

        p {
            font-size: 18px;
            color: #666;
            margin-bottom: 40px;
            line-height: 1.6;
        }

        h2 {
            font-size: 28px;
            color: #333;
            margin-bottom: 30px;
            text-align: left;
        }

        .service-list {
            list-style-type: none;
            padding: 0;
            margin: 0;
        }

        .service-list li {
            margin: 15px 0;
            text-align: left;
        }

        .service-link {
            display: block;
            background-color: #4CAF50;
            color: white;
            padding: 12px 30px;
            font-size: 18px;
            text-decoration: none;
            border-radius: 8px;
            transition: background-color 0.3s ease;
            text-align: center;
        }

        .service-link:hover {
            background-color: #45a049;
        }

        .service-link:active {
            background-color: #388e3c;
        }

        .service-link:focus {
            outline: none;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 90%;
            }

            h1 {
                font-size: 28px;
            }

            h2 {
                font-size: 24px;
            }

            .service-link {
                font-size: 16px;
                padding: 10px 25px;
            }
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Garage Insurance Services</h1>
    <p>Manage your vehicle insurance policies and claims with ease at our garage. You can view, add, update, or delete insurance policies, and file claims when necessary.</p>

    <h2>Available Actions</h2>
    <ul class="service-list">
        <li><a href="{% url 'view_insurance_policies' %}" class="service-link">View Insurance Policies</a></li>
        <li><a href="{% url 'add_insurance_policy' %}" class="service-link">Add New Insurance Policy</a></li>
        <li><a href="{% url 'file_insurance_claim' %}" class="service-link">File an Insurance Claim</a></li>
        <li><a href="{% url 'update_insurance_policy' %}" class="service-link">Update Insurance Policy</a></li>
        <li><a href="{% url 'delete_insurance_policy' %}" class="service-link">Delete Insurance Policy</a></li>
    </ul>
</div>

</body>
</html>

Steps to Set Up Views and URLs:

Create Views in your Django views.py to handle the actions:

python
from django.shortcuts import render
from .models import InsurancePolicy, InsuranceClaim

# View to list insurance policies
def view_insurance_policies(request):
    policies = InsurancePolicy.objects.all()
    return render(request, 'view_insurance_policies.html', {'policies': policies})

# View to add a new insurance policy
def add_insurance_policy(request):
    return render(request, 'add_insurance_policy.html')

# View to file a new insurance claim
def file_insurance_claim(request):
    return render(request, 'file_insurance_claim.html')

# View to update an existing insurance policy
def update_insurance_policy(request, policy_id):
    policy = InsurancePolicy.objects.get(id=policy_id)
    return render(request, 'update_insurance_policy.html', {'policy': policy})

# View to delete an insurance policy
def delete_insurance_policy(request, policy_id):
    policy = InsurancePolicy.objects.get(id=policy_id)
    policy.delete()
    return redirect('view_insurance_policies')

Set Up URLs for each view in your urls.py:

python
from django.urls import path
from . import views

urlpatterns = [
    path('insurance/view/', views.view_insurance_policies, name='view_insurance_policies'),
    path('insurance/add/', views.add_insurance_policy, name='add_insurance_policy'),
    path('insurance/claim/', views.file_insurance_claim, name='file_insurance_claim'),
    path('insurance/update/<int:policy_id>/', views.update_insurance_policy, name='update_insurance_policy'),
    path('insurance/delete/<int:policy_id>/', views.delete_insurance_policy, name='delete_insurance_policy'),
]

Explanation:

View Insurance Policies: Displays a list of all insurance policies.
Add New Insurance Policy: Shows a form to add a new insurance policy.
File an Insurance Claim: Displays a form to file an insurance claim.
Update Insurance Policy: Allows updating an existing insurance policy.
Delete Insurance Policy: Deletes the selected insurance policy.

Templates:

You’ll also need to create the following template files:

view_insurance_policies.html
add_insurance_policy.html
file_insurance_claim.html
update_insurance_policy.html

Each will contain the appropriate forms or views to perform the actions.

Let me know if you need help setting up any of the forms or templates!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Garage Insurance Services</title> <style> body { font-family: 'Arial', sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 80%; max-width: 900px; margin: 50px auto; background-color: #fff; padding: 40px; box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1); border-radius: 12px; text-align: center; } h1 { font-size: 36px; color: #333; margin-bottom: 20px; } p { font-size: 18px; color: #666; margin-bottom: 40px; line-height: 1.6; } h2 { font-size: 28px; color: #333; margin-bottom: 30px; text-align: left; } .service-list { list-style-type: none; padding: 0; margin: 0; } .service-list li { margin: 15px 0; text-align: left; } .service-link { display: block; background-color: #4CAF50; color: white; padding: 12px 30px; font-size: 18px; text-decoration: none; border-radius: 8px; transition: background-color 0.3s ease; text-align: center; } .service-link:hover { background-color: #45a049; } .service-link:active { background-color: #388e3c; } .service-link:focus { outline: none; } /* Responsive Design */ @media (max-width: 768px) { .container { width: 90%; } h1 { font-size: 28px; } h2 { font-size: 24px; } .service-link { font-size: 16px; padding: 10px 25px; } } </style> </head> <body> <div class="container"> <h1>Garage Insurance Services</h1> <p>Manage your vehicle insurance policies and claims with ease at our garage. You can view, add, update, or delete insurance policies, and file claims when necessary.</p> <h2>Available Actions</h2> <ul class="service-list"> <li><a href="{% url 'view_insurance_policies' %}" class="service-link">View Insurance Policies</a></li> <li><a href="{% url 'add_insurance_policy' %}" class="service-link">Add New Insurance Policy</a></li> <li><a href="{% url 'file_insurance_claim' %}" class="service-link">File an Insurance Claim</a></li> <li><a href="{% url 'update_insurance_policy' %}" class="service-link">Update Insurance Policy</a></li> <li><a href="{% url 'delete_insurance_policy' %}" class="service-link">Delete Insurance Policy</a></li> </ul> </div> </body> </html>

Your HTML structure looks well set up! The links are now connected to the Django URLs using the {% url %} tag, which is perfect for dynamic routing in Django.

Here’s a summary of how to proceed with the backend:

Backend Setup:

Views: You already have the views set up in Django for each action like viewing, adding, updating, and deleting insurance policies.

URLs: Make sure you’ve added the appropriate URL patterns in your urls.py to handle each action. Here’s a quick reminder:

python
from django.urls import path
from . import views

urlpatterns = [
    path('insurance/view/', views.view_insurance_policies, name='view_insurance_policies'),
    path('insurance/add/', views.add_insurance_policy, name='add_insurance_policy'),
    path('insurance/claim/', views.file_insurance_claim, name='file_insurance_claim'),
    path('insurance/update/<int:policy_id>/', views.update_insurance_policy, name='update_insurance_policy'),
    path('insurance/delete/<int:policy_id>/', views.delete_insurance_policy, name='delete_insurance_policy'),
]

Templates: Ensure that the corresponding templates (view_insurance_policies.html, add_insurance_policy.html, etc.) are created in your templates folder to match each view’s logic.

Forms: For actions like adding and updating insurance policies, you’ll need forms to capture the necessary data. Here’s an example for adding a policy:

python
# forms.py
from django import forms
from .models import InsurancePolicy

class InsurancePolicyForm(forms.ModelForm):
    class Meta:
        model = InsurancePolicy
        fields = ['policy_number', 'vehicle', 'start_date', 'end_date', 'premium']

Admin: If you want to manage insurance policies through the Django admin panel, ensure you’ve registered the model in admin.py:

python
from django.contrib import admin
from .models import InsurancePolicy

admin.site.register(InsurancePolicy)

Next Steps:

Test your views by running the Django development server.
Ensure the links navigate to the appropriate pages.
For dynamic functionality like deleting, updating, or viewing insurance policies, make sure the views handle the necessary logic and form submissions.

Let me know if you need help with any specific part of the backend or forms!

NoReverseMatch at /insurance/ Reverse for 'update_insurance_policy' with no arguments not found. 1 pattern(s) tried: ['insurance/policy/update/(?P<policy_id>[0-9]+)/\\Z'] Request Method: GET Request URL: http://127.0.0.1:8000/insurance/ Django Version: 5.1.7 Exception Type: NoReverseMatch Exception Value: Reverse for 'update_insurance_policy' with no arguments not found. 1 pattern(s) tried: ['insurance/policy/update/(?P<policy_id>[0-9]+)/\\Z'] Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\urls\resolvers.py, line 831, in _reverse_with_prefix Raised during: insurance.views.insurance_home Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Sun, 30 Mar 2025 20:52:12 +0000

The error you're seeing (NoReverseMatch) indicates that the URL pattern for the update_insurance_policy view is expecting an argument, specifically policy_id, but it's not being passed in the template.

The URL pattern defined in urls.py is:

python
path('insurance/update/<int:policy_id>/', views.update_insurance_policy, name='update_insurance_policy')

This means that when you reverse the URL using {% url 'update_insurance_policy' %}, it expects an argument (policy_id in this case).

Solution:

To fix this, you need to pass a policy_id argument when generating the URL in the template. For example, if you are listing insurance policies and each policy has an ID, you should pass that ID in the link.

Here’s how you can update the template:

html
<li><a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="service-link">Update Insurance Policy</a></li>

Make sure you have access to the policy.id in the context. If you're rendering this list inside a loop where each policy has an id, this will work perfectly.

Here’s a full example if you’re iterating over policies:

html
<h2>Available Insurance Policies</h2>
<ul class="service-list">
    {% for policy in insurance_policies %}
        <li>
            <a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="service-link">Update {{ policy.policy_number }}</a>
        </li>
    {% endfor %}
</ul>

Backend Context:

In the corresponding view, make sure you’re passing the insurance_policies to the template context:

python
# views.py
from django.shortcuts import render
from .models import InsurancePolicy

def insurance_home(request):
    insurance_policies = InsurancePolicy.objects.all()
    return render(request, 'insurance_home.html', {'insurance_policies': insurance_policies})

This should resolve the NoReverseMatch error by providing the policy_id for the update link.

Let me know if this helps or if you need further clarification!

TemplateDoesNotExist at /insurance/ insurancehome.html Request Method: GET Request URL: http://127.0.0.1:8000/insurance/ Django Version: 5.1.7 Exception Type: TemplateDoesNotExist Exception Value: insurancehome.html Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\loader.py, line 19, in get_template Raised during: insurance.views.insurance_home Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Sun, 30 Mar 2025 20:56:45 +0000 Template-loader postmortem Django tried loading these templates, in this order: Using engine django: django.template.loaders.filesystem.Loader: C:\Users\lau\Desktop\Projects\garage_system\core\templates\core\insurancehome.html (Source does not exist) django.template.loaders.app_directories.Loader: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\admin\templates\insurancehome.html (Source does not exist) django.template.loaders.app_directories.Loader: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\auth\templates\insurancehome.html (Source does not exist) django.template.loaders.app_directories.Loader: C:\Users\lau\Desktop\Projects\garage_system\core\templates\insurancehome.html (Source does not exist) django.template.loaders.app_directories.Loader: C:\Users\lau\Desktop\Projects\garage_system\accounts\templates\insurancehome.html (Source does not exist) django.template.loaders.app_directories.Loader: C:\Users\lau\Desktop\Projects\garage_system\vehicles\templates\insurancehome.html (Source does not exist) django.template.loaders.app_directories.Loader: C:\Users\lau\Desktop\Projects\garage_system\services\templates\insurancehome.html (Source does not exist) django.template.loaders.app_directories.Loader: C:\Users\lau\Desktop\Projects\garage_system\billing\templates\insurancehome.html (Source does not exist) django.template.loaders.app_directories.Loader: C:\Users\lau\Desktop\Projects\garage_system\insurance\templates\insurancehome.html (Source does not exist) Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\insurance\views.py, line 7, in insurance_home return render(request, 'insurance/home.html',

The error you're seeing, TemplateDoesNotExist, indicates that Django is looking for a template called insurancehome.html but it can't find it in any of the directories.

From the traceback, it looks like in your views.py, you're trying to render a template named 'insurance/home.html':

python
return render(request, 'insurance/home.html', {...})

However, Django cannot locate this template file, which is causing the error.

Solution:

Make Sure the Template Exists: Verify that the template home.html (or insurancehome.html based on your structure) is located in the correct directory, for example:
- your_project/insurance/templates/insurance/home.html
If the file isn't there, you need to create it, or if it has a different name, you should adjust the render statement to use the correct path.
Correct Template Path: If your template is named insurancehome.html, make sure to reference it correctly:

In views.py:
```
python
return render(request, 'insurance/insurancehome.html', {...})
```
If the template is inside the templates folder of your app insurance, the structure would be something like this:
```
garage_system/
├── insurance/
    ├── templates/
        ├── insurance/
            ├── insurancehome.html
```

Check Template Settings: Ensure that your settings.py is configured to find templates. Under the TEMPLATES setting, make sure APP_DIRS is set to True so that Django can automatically look in each app’s templates folder:

python
TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,  # This is important
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

Run the Server After Changes: After verifying or adding the template, restart your server to ensure that Django can pick up the changes.

Once you've done these steps, your template should load correctly. Let me know if you need any further help!

NoReverseMatch at /insurance/ Reverse for 'update_insurance_policy' with no arguments not found. 1 pattern(s) tried: ['insurance/insurance/update/(?P<policy_id>[0-9]+)/\\Z'] Request Method: GET Request URL: http://127.0.0.1:8000/insurance/ Django Version: 5.1.7 Exception Type: NoReverseMatch Exception Value: Reverse for 'update_insurance_policy' with no arguments not found. 1 pattern(s) tried: ['insurance/insurance/update/(?P<policy_id>[0-9]+)/\\Z'] Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\urls\resolvers.py, line 831, in _reverse_with_prefix Raised during: insurance.views.insurance_home Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Sun, 30 Mar 2025 20:58:35 +0000

The error you're encountering, NoReverseMatch, happens when Django is unable to find a matching URL pattern that corresponds to the name you're providing in the template.

In this case, it looks like the URL pattern for the 'update_insurance_policy' view is defined with a policy_id argument, but you're trying to use it in the template without providing that argument.

Problem

The URL pattern is likely defined like this:

python
path('insurance/update/<int:policy_id>/', views.update_insurance_policy, name='update_insurance_policy'),

However, in your template, you are trying to reverse the URL without providing the necessary policy_id:

html
<a href="{% url 'update_insurance_policy' %}" class="service-link">Update Insurance Policy</a>

This is missing the policy_id argument, which is why Django can't resolve the URL.

Solution

You need to pass the policy_id to the url tag. Depending on the context, if you're listing policies, you'd need to provide the ID of the policy you want to update. For example:

html
<a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="service-link">Update Insurance Policy</a>

Where policy.id is the ID of the specific insurance policy you want to update.

If you're in a list view, each policy should have an ID attribute, and you'd pass that ID to the URL for updating the policy.

Example:

If you have a list of insurance policies, the loop might look like this:

html
<ul class="service-list">
    {% for policy in insurance_policies %}
        <li>
            <a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="service-link">Update Insurance Policy</a>
        </li>
    {% endfor %}
</ul>

In this example, each policy in insurance_policies will have a link to the update page with its specific policy_id.

Make sure you're passing the correct policy_id for each policy when generating the links in the template. Let me know if you need further clarification!

NoReverseMatch at /insurance/ Reverse for 'update_insurance_policy' with keyword arguments '{'policy_id': ''}' not found. 1 pattern(s) tried: ['insurance/insurance/update/(?P<policy_id>[0-9]+)/\\Z'] Request Method: GET Request URL: http://127.0.0.1:8000/insurance/ Django Version: 5.1.7 Exception Type: NoReverseMatch Exception Value: Reverse for 'update_insurance_policy' with keyword arguments '{'policy_id': ''}' not found. 1 pattern(s) tried: ['insurance/insurance/update/(?P<policy_id>[0-9]+)/\\Z'] Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\urls\resolvers.py, line 831, in _reverse_with_prefix Raised during: insurance.views.insurance_home Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Sun, 30 Mar 2025 21:01:25 +0000 Error during template rendering In template C:\Users\lau\Desktop\Projects\garage_system\insurance\templates\insurance\home.html, error at line 113 Reverse for 'update_insurance_policy' with keyword arguments '{'policy_id': ''}' not found. 1 pattern(s) tried: ['insurance/insurance/update/(?P<policy_id>[0-9]+)/\\Z']

The error you're encountering, Reverse for 'update_insurance_policy' with keyword arguments '{'policy_id': ''}' not found, suggests that the policy.id is being passed as an empty string ('') when trying to generate the URL for the update_insurance_policy view.

Why this is happening:

It seems that in your template, you're trying to reverse the URL with an empty policy_id. This likely means that the policy.id is not being correctly passed or retrieved in the view.
You might be iterating over a list of insurance policies, but not all of them have a valid id.

Steps to Fix:

Check that each policy has a valid id: Ensure that all insurance policy objects in your list have valid IDs. If the id is None or not set, Django will fail to resolve the URL.

Example:
```
python
insurance_policies = InsurancePolicy.objects.all()
```
If insurance_policies contains any policies without an id, Django won't be able to resolve the URL correctly.

Add a conditional check: In the template, add a check to ensure that policy.id exists and is valid before trying to use it in the URL:

html
<ul class="service-list">
    {% for policy in insurance_policies %}
        {% if policy.id %}
            <li>
                <a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="service-link">Update Insurance Policy</a>
            </li>
        {% else %}
            <li>Policy ID missing</li>
        {% endif %}
    {% endfor %}
</ul>

Ensure you're passing the correct context: When rendering the home.html template, make sure that insurance_policies is being passed to the template and contains the correct data:

In your view:

python
from django.shortcuts import render
from .models import InsurancePolicy

def insurance_home(request):
    insurance_policies = InsurancePolicy.objects.all()
    return render(request, 'insurance/home.html', {'insurance_policies': insurance_policies})

Check the database: If the insurance_policies list contains entries with missing or None values for id, ensure that your database records are correctly populated.

By adding the conditional check ({% if policy.id %}), you prevent any None or invalid IDs from breaking the URL generation.

Let me know how it goes!

from django.shortcuts import render,redirect,get_object_or_404 from .models import * from .forms import * def insurance_home(request): insurance_policies = InsurancePolicy.objects.all() return render(request, 'insurance/home.html', {'insurance_policies': insurance_policies}) def view_insurance_policies(request): policies = InsurancePolicy.objects.all() return render(request, 'insurance/view_policies.html', {'policies': policies}) def add_insurance_policy(request): if request.method == 'POST': form = InsurancePolicyForm(request.POST) if form.is_valid(): form.save() return redirect('view_insurance_policies') else: form = InsurancePolicyForm() return render(request, 'insurance/add_policy.html', {'form': form}) def file_insurance_claim(request): if request.method == 'POST': form = InsuranceClaimForm(request.POST) if form.is_valid(): form.save() return redirect('view_insurance_policies') # Redirect back to policies or a claim success page else: form = InsuranceClaimForm() return render(request, 'insurance/file_claim.html', {'form': form}) def update_insurance_policy(request, policy_id): policy = get_object_or_404(InsurancePolicy, id=policy_id) if request.method == 'POST': form = InsurancePolicyForm(request.POST, instance=policy) if form.is_valid(): form.save() return redirect('view_insurance_policies') else: form = InsurancePolicyForm(instance=policy) return render(request, 'insurance/update_policy.html', {'form': form, 'policy': policy}) def delete_insurance_policy(request, policy_id): policy = get_object_or_404(InsurancePolicy, id=policy_id) if request.method == 'POST': policy.delete() return redirect('view_insurance_policies') return render(request, 'insurance/delete_policy.html', {'policy': policy}) check what might be causing the error

Your views look good, but the issue is likely originating from the way the policy_id is being passed in the URL when trying to update or delete an insurance policy. Specifically, the error suggests that when you try to reverse the update_insurance_policy URL, it's being passed an empty or invalid policy_id.

Troubleshooting steps:

URL Pattern: Ensure your urls.py has the correct pattern that captures the policy_id argument.

Example of the URL pattern for updating the policy:

python
from django.urls import path
from . import views

urlpatterns = [
    path('', views.insurance_home, name='insurance_home'),
    path('view/', views.view_insurance_policies, name='view_insurance_policies'),
    path('add/', views.add_insurance_policy, name='add_insurance_policy'),
    path('file_claim/', views.file_insurance_claim, name='file_insurance_claim'),
    path('update/<int:policy_id>/', views.update_insurance_policy, name='update_insurance_policy'),
    path('delete/<int:policy_id>/', views.delete_insurance_policy, name='delete_insurance_policy'),
]

Note: You need the policy_id to be captured as part of the URL (in update/<int:policy_id>/ and delete/<int:policy_id>/). The int:policy_id part makes sure that Django correctly captures the ID of the policy and passes it to your views.

Template Check: In your template, make sure you're passing the correct policy.id to the update_insurance_policy and delete_insurance_policy URLs.

Update the template to check if the policy.id exists:

html
<ul class="service-list">
    {% for policy in insurance_policies %}
        {% if policy.id %}
            <li>
                <a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="service-link">Update Insurance Policy</a>
            </li>
            <li>
                <a href="{% url 'delete_insurance_policy' policy_id=policy.id %}" class="service-link">Delete Insurance Policy</a>
            </li>
        {% else %}
            <li>Policy ID missing</li>
        {% endif %}
    {% endfor %}
</ul>

This ensures that the policy.id is passed when constructing the URL.

Check Database: Make sure that all insurance policies have a valid id in the database. If any policy has an invalid or missing id, Django will not be able to reverse the URL for it.
Redirect and URL Naming: Ensure that when you perform redirects or reverse the URLs, the names match the ones you have set in urls.py. For instance, 'view_insurance_policies' should be the correct name for the URL pattern that renders the list of policies.

Summary of the fixes:

Ensure that the urls.py captures the policy_id properly in both the update and delete URL patterns.
In the template, ensure you pass policy.id as an argument to the URL.
Verify that all policies have a valid id in the database.

Once these fixes are applied, the error should be resolved. Let me know if you need further help!

from django.urls import path from .views import * urlpatterns = [ path('', insurance_home, name='insurance'), path('policies/', view_insurance_policies, name='view_insurance_policies'), path('policy/add/', add_insurance_policy, name='add_insurance_policy'), path('claim/file/', file_insurance_claim, name='file_insurance_claim'), path('update/<int:policy_id>/', update_insurance_policy, name='update_insurance_policy'), path('policy/delete/<int:policy_id>/', delete_insurance_policy, name='delete_insurance_policy'), ] from django.shortcuts import render,redirect,get_object_or_404 from .models import * from .forms import * def insurance_home(request): insurance_policies = InsurancePolicy.objects.all() return render(request, 'insurance/home.html', {'insurance_policies': insurance_policies}) def view_insurance_policies(request): policies = InsurancePolicy.objects.all() return render(request, 'insurance/view_policies.html', {'policies': policies}) def add_insurance_policy(request): if request.method == 'POST': form = InsurancePolicyForm(request.POST) if form.is_valid(): form.save() return redirect('view_insurance_policies') else: form = InsurancePolicyForm() return render(request, 'insurance/add_policy.html', {'form': form}) def file_insurance_claim(request): if request.method == 'POST': form = InsuranceClaimForm(request.POST) if form.is_valid(): form.save() return redirect('view_insurance_policies') # Redirect back to policies or a claim success page else: form = InsuranceClaimForm() return render(request, 'insurance/file_claim.html', {'form': form}) def update_insurance_policy(request, policy_id): policy = get_object_or_404(InsurancePolicy, id=policy_id) if request.method == 'POST': form = InsurancePolicyForm(request.POST, instance=policy) if form.is_valid(): form.save() return redirect('view_insurance_policies') else: form = InsurancePolicyForm(instance=policy) return render(request, 'insurance/update_policy.html', {'form': form, 'policy': policy}) def delete_insurance_policy(request, policy_id): policy = get_object_or_404(InsurancePolicy, id=policy_id) if request.method == 'POST': policy.delete() return redirect('view_insurance_policies') return render(request, 'insurance/delete_policy.html', {'policy': policy}) <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Garage Insurance Services</title> <style> body { font-family: 'Arial', sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 80%; max-width: 900px; margin: 50px auto; background-color: #fff; padding: 40px; box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1); border-radius: 12px; text-align: center; } h1 { font-size: 36px; color: #333; margin-bottom: 20px; } p { font-size: 18px; color: #666; margin-bottom: 40px; line-height: 1.6; } h2 { font-size: 28px; color: #333; margin-bottom: 30px; text-align: left; } .service-list { list-style-type: none; padding: 0; margin: 0; } .service-list li { margin: 15px 0; text-align: left; } .service-link { display: block; background-color: #4CAF50; color: white; padding: 12px 30px; font-size: 18px; text-decoration: none; border-radius: 8px; transition: background-color 0.3s ease; text-align: center; } .service-link:hover { background-color: #45a049; } .service-link:active { background-color: #388e3c; } .service-link:focus { outline: none; } /* Responsive Design */ @media (max-width: 768px) { .container { width: 90%; } h1 { font-size: 28px; } h2 { font-size: 24px; } .service-link { font-size: 16px; padding: 10px 25px; } } </style> </head> <body> <div class="container"> <h1>Garage Insurance Services</h1> <p>Manage your vehicle insurance policies and claims with ease at our garage. You can view, add, update, or delete insurance policies, and file claims when necessary.</p> <h2>Available Actions</h2> <ul class="service-list"> <li><a href="{% url 'view_insurance_policies' %}" class="service-link">View Insurance Policies</a></li> <li><a href="{% url 'add_insurance_policy' %}" class="service-link">Add New Insurance Policy</a></li> <li><a href="{% url 'file_insurance_claim' %}" class="service-link">File an Insurance Claim</a></li> <li><a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="service-link">Update Insurance Policy</a></li> <li><a href="{% url 'delete_insurance_policy' %}" class="service-link">Delete Insurance Policy</a></li> </ul> </div> </body> </html>

It looks like the issue is with the link for updating and deleting the insurance policies in your template. Specifically, for the update and delete links, you're not passing the correct policy_id to the delete_insurance_policy URL.

Here are the specific fixes:

Update link: You correctly use {% url 'update_insurance_policy' policy_id=policy.id %}, but the policy object isn't defined in the template for the home page where the list of insurance policies is shown. To fix this, you need to ensure that you are iterating over the insurance_policies list in the template, which is passed from the insurance_home view.

Here's the corrected part for the update_insurance_policy link:
```
html
<ul class="service-list">
    {% for policy in insurance_policies %}
        <li>
            <a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="service-link">Update Insurance Policy</a>
        </li>
        <li>
            <a href="{% url 'delete_insurance_policy' policy_id=policy.id %}" class="service-link">Delete Insurance Policy</a>
        </li>
    {% endfor %}
</ul>
```
This will loop through the insurance_policies and generate the correct update and delete links for each policy.

Delete link: You also need to pass policy_id=policy.id in the delete_insurance_policy URL like this:

html
<li>
    <a href="{% url 'delete_insurance_policy' policy_id=policy.id %}" class="service-link">Delete Insurance Policy</a>
</li>

Full Template with Fixes:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Garage Insurance Services</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 80%;
            max-width: 900px;
            margin: 50px auto;
            background-color: #fff;
            padding: 40px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            text-align: center;
        }

        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 20px;
        }

        p {
            font-size: 18px;
            color: #666;
            margin-bottom: 40px;
            line-height: 1.6;
        }

        h2 {
            font-size: 28px;
            color: #333;
            margin-bottom: 30px;
            text-align: left;
        }

        .service-list {
            list-style-type: none;
            padding: 0;
            margin: 0;
        }

        .service-list li {
            margin: 15px 0;
            text-align: left;
        }

        .service-link {
            display: block;
            background-color: #4CAF50;
            color: white;
            padding: 12px 30px;
            font-size: 18px;
            text-decoration: none;
            border-radius: 8px;
            transition: background-color 0.3s ease;
            text-align: center;
        }

        .service-link:hover {
            background-color: #45a049;
        }

        .service-link:active {
            background-color: #388e3c;
        }

        .service-link:focus {
            outline: none;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 90%;
            }

            h1 {
                font-size: 28px;
            }

            h2 {
                font-size: 24px;
            }

            .service-link {
                font-size: 16px;
                padding: 10px 25px;
            }
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Garage Insurance Services</h1>
    <p>Manage your vehicle insurance policies and claims with ease at our garage. You can view, add, update, or delete insurance policies, and file claims when necessary.</p>

    <h2>Available Actions</h2>
    <ul class="service-list">
        <li><a href="{% url 'view_insurance_policies' %}" class="service-link">View Insurance Policies</a></li>
        <li><a href="{% url 'add_insurance_policy' %}" class="service-link">Add New Insurance Policy</a></li>
        <li><a href="{% url 'file_insurance_claim' %}" class="service-link">File an Insurance Claim</a></li>
        
        <!-- Loop through the policies and generate links for each policy -->
        {% for policy in insurance_policies %}
            <li>
                <a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="service-link">Update Insurance Policy</a>
            </li>
            <li>
                <a href="{% url 'delete_insurance_policy' policy_id=policy.id %}" class="service-link">Delete Insurance Policy</a>
            </li>
        {% endfor %}
    </ul>
</div>

</body>
</html>

This should fix the error you're seeing and correctly render the update and delete links for each insurance policy.

Let me know if it works!

To make your view_policies.html page look visually appealing, I will add some styling and design improvements. The layout will include a clean, modern look with a nice list of policies, along with better typography, spacing, and buttons for actions.

Here’s an updated design for your view_policies.html:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Insurance Policies</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 80%;
            max-width: 900px;
            margin: 50px auto;
            background-color: #fff;
            padding: 40px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            text-align: center;
        }

        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 30px;
            text-align: center;
        }

        .policy-list {
            list-style-type: none;
            padding: 0;
            margin: 0;
        }

        .policy-list li {
            background-color: #f9f9f9;
            padding: 15px;
            margin: 10px 0;
            border-radius: 8px;
            box-shadow: 0px 2px 6px rgba(0, 0, 0, 0.1);
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 18px;
            color: #333;
            transition: background-color 0.3s ease;
        }

        .policy-list li:hover {
            background-color: #f1f1f1;
        }

        .policy-details {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .policy-actions {
            display: flex;
            gap: 15px;
        }

        .btn {
            padding: 8px 15px;
            background-color: #4CAF50;
            color: white;
            text-decoration: none;
            border-radius: 8px;
            font-size: 16px;
            transition: background-color 0.3s ease;
        }

        .btn:hover {
            background-color: #45a049;
        }

        .btn:focus {
            outline: none;
        }

        .policy-header {
            font-size: 22px;
            font-weight: bold;
            color: #333;
            margin-bottom: 25px;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 90%;
            }

            h1 {
                font-size: 28px;
            }

            .policy-list li {
                font-size: 16px;
            }
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Insurance Policies</h1>
    
    <!-- Header Section -->
    <div class="policy-header">
        <p>Here you can view and manage all the insurance policies associated with the garage.</p>
    </div>

    <!-- Policy List -->
    <ul class="policy-list">
        {% for policy in policies %}
            <li>
                <div class="policy-details">
                    <strong>Policy Number:</strong> {{ policy.policy_number }}<br>
                    <strong>Provider:</strong> {{ policy.provider }}<br>
                    <strong>Coverage Type:</strong> {{ policy.coverage_type }}<br>
                    <strong>Premium Amount:</strong> KSh {{ policy.premium_amount|floatformat:2 }}
                </div>
                
                <div class="policy-actions">
                    <a href="{% url 'update_insurance_policy' policy_id=policy.id %}" class="btn">Update</a>
                    <a href="{% url 'delete_insurance_policy' policy_id=policy.id %}" class="btn" style="background-color: #e57373;">Delete</a>
                </div>
            </li>
        {% endfor %}
    </ul>
</div>

</body>
</html>

Key Design Improvements:

Typography and Spacing:
- I've adjusted font sizes for better readability.
- The text has more defined sections for clarity.
List Styling:
- The insurance policies are now displayed in a card-like format with rounded corners and subtle shadow effects to make each item stand out.
- A hover effect is applied to each item in the list to enhance interactivity.
Buttons:
- There are now buttons for "Update" and "Delete" each policy, with a green color for "Update" and red for "Delete" to visually distinguish them.
- Buttons are styled with rounded corners and have a hover effect to improve the UI/UX.
Responsiveness:
- The layout adjusts for smaller screens (e.g., mobile devices) by reducing font sizes and adjusting container widths.

How It Works:

When you visit the page with the view_insurance_policies view, you'll see a well-organized list of policies with options to update or delete them.
The policy number, provider, coverage type, and premium amount will be displayed in a clean and structured way.
The "Update" and "Delete" buttons are aligned to the right, making them easily accessible.

This should create a visually appealing and user-friendly interface for viewing insurance policies! Let me know if you'd like any further adjustments.

Here’s an updated design for your add_policy.html page to make it more visually appealing and user-friendly:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Add New Insurance Policy</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 80%;
            max-width: 900px;
            margin: 50px auto;
            background-color: #fff;
            padding: 40px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            text-align: center;
        }

        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 30px;
        }

        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
            align-items: center;
        }

        .form-group {
            width: 100%;
            max-width: 600px;
            margin: 10px 0;
        }

        label {
            font-size: 18px;
            color: #333;
            margin-bottom: 8px;
            display: block;
        }

        input, select {
            width: 100%;
            padding: 12px;
            font-size: 16px;
            border-radius: 8px;
            border: 1px solid #ddd;
            background-color: #f9f9f9;
            margin-top: 8px;
            transition: border 0.3s ease;
        }

        input:focus, select:focus {
            border-color: #4CAF50;
            outline: none;
        }

        button {
            padding: 12px 25px;
            font-size: 18px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            margin-top: 20px;
        }

        button:hover {
            background-color: #45a049;
        }

        button:focus {
            outline: none;
        }

        .back-link {
            margin-top: 30px;
            font-size: 16px;
            color: #007BFF;
            text-decoration: none;
        }

        .back-link:hover {
            text-decoration: underline;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 90%;
            }

            h1 {
                font-size: 28px;
            }

            input, select {
                font-size: 14px;
            }

            button {
                font-size: 16px;
                padding: 10px 20px;
            }
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Add New Insurance Policy</h1>
    
    <form method="post">
        {% csrf_token %}
        
        <!-- Form Fields -->
        <div class="form-group">
            {{ form.policy_number.errors }}
            <label for="id_policy_number">Policy Number</label>
            {{ form.policy_number }}
        </div>

        <div class="form-group">
            {{ form.provider.errors }}
            <label for="id_provider">Provider</label>
            {{ form.provider }}
        </div>

        <div class="form-group">
            {{ form.coverage_type.errors }}
            <label for="id_coverage_type">Coverage Type</label>
            {{ form.coverage_type }}
        </div>

        <div class="form-group">
            {{ form.premium_amount.errors }}
            <label for="id_premium_amount">Premium Amount</label>
            {{ form.premium_amount }}
        </div>

        <!-- Submit Button -->
        <button type="submit">Add Policy</button>
    </form>

    <!-- Back Link -->
    <a href="{% url 'view_insurance_policies' %}" class="back-link">Back to Policies</a>
</div>

</body>
</html>

Key Design Improvements:

Form Layout:
- The form is centered inside a container div with padding and shadows for a modern card-like appearance.
- Input fields are nicely spaced and easy to interact with, featuring rounded corners and a soft background color.
Form Styling:
- Each form field is wrapped inside a .form-group with clear labels and input fields.
- Input fields have a subtle border change on focus to improve user experience.
Button Styling:
- The "Add Policy" button has a green color with a hover effect for interactivity, making it visually appealing and clear that it’s an actionable button.
Back Link:
- A link to go back to the insurance policies page has been added at the bottom for easy navigation. It's styled with a blue color and underline on hover for a better user experience.
Responsive Design:
- The page layout adjusts for smaller screens. Form inputs, labels, and the button become more compact on mobile screens, improving usability.

This design will create a clean and professional interface for adding new insurance policies, making the experience smoother for users. Let me know if you'd like to make further tweaks!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Add New Insurance Policy</title> <style> body { font-family: 'Arial', sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 80%; max-width: 900px; margin: 50px auto; background-color: #fff; padding: 40px; box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1); border-radius: 12px; text-align: center; } h1 { font-size: 36px; color: #333; margin-bottom: 30px; } form { display: flex; flex-direction: column; gap: 20px; align-items: center; } .form-group { width: 100%; max-width: 600px; margin: 10px 0; } label { font-size: 18px; color: #333; margin-bottom: 8px; display: block; } input, select { width: 100%; padding: 12px; font-size: 16px; border-radius: 8px; border: 1px solid #ddd; background-color: #f9f9f9; margin-top: 8px; transition: border 0.3s ease; } input:focus, select:focus { border-color: #4CAF50; outline: none; } button { padding: 12px 25px; font-size: 18px; background-color: #4CAF50; color: white; border: none; border-radius: 8px; cursor: pointer; transition: background-color 0.3s ease; margin-top: 20px; } button:hover { background-color: #45a049; } button:focus { outline: none; } .back-link { margin-top: 30px; font-size: 16px; color: #007BFF; text-decoration: none; } .back-link:hover { text-decoration: underline; } /* Responsive Design */ @media (max-width: 768px) { .container { width: 90%; } h1 { font-size: 28px; } input, select { font-size: 14px; } button { font-size: 16px; padding: 10px 20px; } } </style> </head> <body> <div class="container"> <h1>Add New Insurance Policy</h1> <form method="post"> {% csrf_token %}  <div class="form-group"> {{ form.policy_number.errors }} <label for="id_policy_number">Policy Number</label> {{ form.policy_number }} </div> <div class="form-group"> {{ form.provider.errors }} <label for="id_provider">Provider</label> {{ form.provider }} </div> <div class="form-group"> {{ form.coverage_type.errors }} <label for="id_coverage_type">Coverage Type</label> {{ form.coverage_type }} </div> <div class="form-group"> {{ form.premium_amount.errors }} <label for="id_premium_amount">Premium Amount</label> {{ form.premium_amount }} </div>  <button type="submit">Add Policy</button> </form>  <a href="{% url 'view_insurance_policies' %}" class="back-link">Back to Policies</a> </div> </body> </html> design well space neetly

Here’s a refined version of your HTML for better spacing, neatness, and overall design:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Add New Insurance Policy</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 80%;
            max-width: 900px;
            margin: 50px auto;
            background-color: #fff;
            padding: 40px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            text-align: center;
        }

        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 20px;
            text-align: left;
        }

        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
            align-items: flex-start;
        }

        .form-group {
            width: 100%;
            max-width: 600px;
            margin: 10px 0;
            text-align: left;
        }

        label {
            font-size: 18px;
            color: #333;
            margin-bottom: 8px;
            display: block;
        }

        input, select {
            width: 100%;
            padding: 14px;
            font-size: 16px;
            border-radius: 8px;
            border: 1px solid #ddd;
            background-color: #f9f9f9;
            margin-top: 8px;
            transition: border 0.3s ease;
        }

        input:focus, select:focus {
            border-color: #4CAF50;
            outline: none;
        }

        button {
            padding: 14px 30px;
            font-size: 18px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            margin-top: 20px;
            align-self: center;
        }

        button:hover {
            background-color: #45a049;
        }

        button:focus {
            outline: none;
        }

        .back-link {
            margin-top: 30px;
            font-size: 16px;
            color: #007BFF;
            text-decoration: none;
        }

        .back-link:hover {
            text-decoration: underline;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 90%;
            }

            h1 {
                font-size: 28px;
            }

            input, select {
                font-size: 14px;
            }

            button {
                font-size: 16px;
                padding: 12px 25px;
            }
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Add New Insurance Policy</h1>
    
    <form method="post">
        {% csrf_token %}
        
        <!-- Form Fields -->
        <div class="form-group">
            <label for="id_policy_number">Policy Number</label>
            {{ form.policy_number }}
            <div class="error">{{ form.policy_number.errors }}</div>
        </div>

        <div class="form-group">
            <label for="id_provider">Provider</label>
            {{ form.provider }}
            <div class="error">{{ form.provider.errors }}</div>
        </div>

        <div class="form-group">
            <label for="id_coverage_type">Coverage Type</label>
            {{ form.coverage_type }}
            <div class="error">{{ form.coverage_type.errors }}</div>
        </div>

        <div class="form-group">
            <label for="id_premium_amount">Premium Amount</label>
            {{ form.premium_amount }}
            <div class="error">{{ form.premium_amount.errors }}</div>
        </div>

        <!-- Submit Button -->
        <button type="submit">Add Policy</button>
    </form>

    <!-- Back Link -->
    <a href="{% url 'view_insurance_policies' %}" class="back-link">Back to Policies</a>
</div>

</body>
</html>

Key Enhancements:

Form Spacing:
- The form fields now have more breathing space with increased margin around form groups, and each form element is clearly separated for easy interaction.
Text Alignment:
- All labels and input fields are aligned to the left with uniform padding, making the form appear neat and consistent.
Button Styling:
- The submit button is centered and has a larger padding for a more prominent, clickable appearance.
- On hover, the button changes color to provide better feedback to users.
Error Handling:
- Error messages for the fields are displayed below the respective inputs. This improves the user experience as it clearly indicates validation issues.
Responsive Layout:
- The design adjusts to smaller screen sizes. The input fields and buttons resize appropriately, making the page user-friendly on mobile devices.
Back Link:
- The back link is styled to stand out with a blue color and underlined on hover, guiding users back to the policy view page.

This layout should provide a neat, modern, and easy-to-use form for adding new insurance policies. Let me know if you'd like any further adjustments!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Add New Insurance Policy</title> <style> body { font-family: 'Arial', sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 80%; max-width: 900px; margin: 50px auto; background-color: #fff; padding: 40px; box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1); border-radius: 12px; text-align: center; } h1 { font-size: 36px; color: #333; margin-bottom: 20px; text-align: left; } form { display: flex; flex-direction: column; gap: 20px; align-items: flex-start; } .form-group { width: 100%; max-width: 600px; margin: 10px 0; text-align: left; } label { font-size: 18px; color: #333; margin-bottom: 8px; display: block; } input, select { width: 100%; padding: 14px; font-size: 16px; border-radius: 8px; border: 1px solid #ddd; background-color: #f9f9f9; margin-top: 8px; transition: border 0.3s ease; } input:focus, select:focus { border-color: #4CAF50; outline: none; } button { padding: 14px 30px; font-size: 18px; background-color: #4CAF50; color: white; border: none; border-radius: 8px; cursor: pointer; transition: background-color 0.3s ease; margin-top: 20px; align-self: center; } button:hover { background-color: #45a049; } button:focus { outline: none; } .back-link { margin-top: 30px; font-size: 16px; color: #007BFF; text-decoration: none; } .back-link:hover { text-decoration: underline; } /* Responsive Design */ @media (max-width: 768px) { .container { width: 90%; } h1 { font-size: 28px; } input, select { font-size: 14px; } button { font-size: 16px; padding: 12px 25px; } } </style> </head> <body> <div class="container"> <h1>Add New Insurance Policy</h1> <form method="post"> {% csrf_token %}  <div class="form-group"> <label for="id_policy_number">Policy Number</label> {{ form.policy_number }} <div class="error">{{ form.policy_number.errors }}</div> </div> <div class="form-group"> <label for="id_provider">Provider</label> {{ form.provider }} <div class="error">{{ form.provider.errors }}</div> </div> <div class="form-group"> <label for="id_coverage_type">Coverage Type</label> {{ form.coverage_type }} <div class="error">{{ form.coverage_type.errors }}</div> </div> <div class="form-group"> <label for="id_premium_amount">Premium Amount</label> {{ form.premium_amount }} <div class="error">{{ form.premium_amount.errors }}</div> </div>  <button type="submit">Add Policy</button> </form>  <a href="{% url 'view_insurance_policies' %}" class="back-link">Back to Policies</a> </div> </body> </html> back to policies neatly placed

Here’s an updated version of the HTML code with a neat and properly placed "Back to Policies" link:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Add New Insurance Policy</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 80%;
            max-width: 900px;
            margin: 50px auto;
            background-color: #fff;
            padding: 40px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            text-align: center;
        }

        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 20px;
            text-align: left;
        }

        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
            align-items: flex-start;
        }

        .form-group {
            width: 100%;
            max-width: 600px;
            margin: 10px 0;
            text-align: left;
        }

        label {
            font-size: 18px;
            color: #333;
            margin-bottom: 8px;
            display: block;
        }

        input, select {
            width: 100%;
            padding: 14px;
            font-size: 16px;
            border-radius: 8px;
            border: 1px solid #ddd;
            background-color: #f9f9f9;
            margin-top: 8px;
            transition: border 0.3s ease;
        }

        input:focus, select:focus {
            border-color: #4CAF50;
            outline: none;
        }

        button {
            padding: 14px 30px;
            font-size: 18px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            margin-top: 20px;
            align-self: center;
        }

        button:hover {
            background-color: #45a049;
        }

        button:focus {
            outline: none;
        }

        .back-link {
            margin-top: 40px;
            font-size: 16px;
            color: #007BFF;
            text-decoration: none;
            display: inline-block;
            margin-top: 20px;
            text-align: center;
        }

        .back-link:hover {
            text-decoration: underline;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 90%;
            }

            h1 {
                font-size: 28px;
            }

            input, select {
                font-size: 14px;
            }

            button {
                font-size: 16px;
                padding: 12px 25px;
            }
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Add New Insurance Policy</h1>
    
    <form method="post">
        {% csrf_token %}
        
        <!-- Form Fields -->
        <div class="form-group">
            <label for="id_policy_number">Policy Number</label>
            {{ form.policy_number }}
            <div class="error">{{ form.policy_number.errors }}</div>
        </div>

        <div class="form-group">
            <label for="id_provider">Provider</label>
            {{ form.provider }}
            <div class="error">{{ form.provider.errors }}</div>
        </div>

        <div class="form-group">
            <label for="id_coverage_type">Coverage Type</label>
            {{ form.coverage_type }}
            <div class="error">{{ form.coverage_type.errors }}</div>
        </div>

        <div class="form-group">
            <label for="id_premium_amount">Premium Amount</label>
            {{ form.premium_amount }}
            <div class="error">{{ form.premium_amount.errors }}</div>
        </div>

        <!-- Submit Button -->
        <button type="submit">Add Policy</button>
    </form>

    <!-- Back Link -->
    <a href="{% url 'view_insurance_policies' %}" class="back-link">Back to Policies</a>
</div>

</body>
</html>

Changes made:

Back to Policies Link Positioning: The "Back to Policies" link is now centered and placed just below the form with a margin top of 40px to separate it from the form.
Consistent Spacing: The spacing between the link and the form elements has been adjusted for a cleaner, well-spaced look.
Styling: The link is styled to be blue with an underline effect on hover, maintaining the clean and modern look of the rest of the form.

This should give a neat, professional appearance, and the link will now be clearly placed below the form, making it easy for users to navigate back to the policies page.

Here's a neatly arranged and well-spaced version of your "File an Insurance Claim" page, with a back button included:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>File an Insurance Claim</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 80%;
            max-width: 900px;
            margin: 50px auto;
            background-color: #fff;
            padding: 40px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
            border-radius: 12px;
            text-align: center;
        }

        h1 {
            font-size: 36px;
            color: #333;
            margin-bottom: 20px;
            text-align: left;
        }

        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
            align-items: flex-start;
        }

        .form-group {
            width: 100%;
            max-width: 600px;
            margin: 10px 0;
            text-align: left;
        }

        label {
            font-size: 18px;
            color: #333;
            margin-bottom: 8px;
            display: block;
        }

        input, select, textarea {
            width: 100%;
            padding: 14px;
            font-size: 16px;
            border-radius: 8px;
            border: 1px solid #ddd;
            background-color: #f9f9f9;
            margin-top: 8px;
            transition: border 0.3s ease;
        }

        input:focus, select:focus, textarea:focus {
            border-color: #4CAF50;
            outline: none;
        }

        button {
            padding: 14px 30px;
            font-size: 18px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            margin-top: 20px;
            align-self: center;
        }

        button:hover {
            background-color: #45a049;
        }

        button:focus {
            outline: none;
        }

        .back-link {
            margin-top: 40px;
            font-size: 16px;
            color: #007BFF;
            text-decoration: none;
            display: inline-block;
            margin-top: 20px;
            text-align: center;
        }

        .back-link:hover {
            text-decoration: underline;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 90%;
            }

            h1 {
                font-size: 28px;
            }

            input, select, textarea {
                font-size: 14px;
            }

            button {
                font-size: 16px;
                padding: 12px 25px;
            }
        }
    </style>
</head>
<body>

<div class="container">
    <h1>File an Insurance Claim</h1>
    
    <form method="post">
        {% csrf_token %}
        
        <!-- Form Fields -->
        <div class="form-group">
            <label for="id_claim_number">Claim Number</label>
            {{ form.claim_number }}
            <div class="error">{{ form.claim_number.errors }}</div>
        </div>

        <div class="form-group">
            <label for="id_claimant_name">Claimant Name</label>
            {{ form.claimant_name }}
            <div class="error">{{ form.claimant_name.errors }}</div>
        </div>

        <div class="form-group">
            <label for="id_claim_description">Claim Description</label>
            {{ form.claim_description }}
            <div class="error">{{ form.claim_description.errors }}</div>
        </div>

        <div class="form-group">
            <label for="id_claim_date">Claim Date</label>
            {{ form.claim_date }}
            <div class="error">{{ form.claim_date.errors }}</div>
        </div>

        <!-- Submit Button -->
        <button type="submit">File Claim</button>
    </form>

    <!-- Back Link -->
    <a href="{% url 'view_insurance_policies' %}" class="back-link">Back to Policies</a>
</div>

</body>
</html>

Key Features:

Spacing & Alignment: The form is spaced neatly with a gap of 20px between elements. The input fields are properly aligned and not too big.
Responsive Design: The design is responsive, ensuring it looks good on both mobile and desktop devices.
Back Link: A back link is placed below the form for easy navigation. It's centered and styled with a hover effect to enhance the user experience.

The layout ensures that everything is easy to read and use, while maintaining a clean and professional design.

After filing an insurance claim, the next steps typically depend on your system's workflow and the specific insurance process. Below are some common next steps that could follow after filing a claim:

1. Claim Confirmation

After the user submits the claim, a confirmation message or page should appear, indicating that the claim has been successfully filed.
You could redirect the user to a confirmation page or show a success notification like: "Your claim has been filed successfully! Our team will review it shortly."

2. Claim Review Process

Internal Review: Once the claim is filed, it can be processed by your insurance team. The claim details would be reviewed, and any necessary documentation or investigation may be requested.
You can create an interface for users to check the status of their claim, such as:
- Pending review
- Under investigation
- Approved
- Rejected

3. Notify the Claimant

Once the claim has been reviewed, the user should be notified of the decision.
Notification could include:
- Claim Approved: If the claim is approved, the user will be informed of the next steps (e.g., payout processing, claim settlement, etc.).
- Claim Rejected: If the claim is rejected, the user will be provided with the reason for rejection and any potential next steps or actions they can take.

4. Payout or Compensation

For Approved Claims: If the claim is approved, the next step might involve processing the payout or providing the compensation, such as a reimbursement, repair, or replacement.

5. Tracking the Claim Status

Claim Dashboard: Users should be able to track the status of their claims through a dashboard or a "Claims Status" page. This page would show if the claim is in review, approved, or rejected and offer details on any next actions.

6. Post-Claim Support

Support: After the claim is processed, offer support options for users who may need help or want to ask follow-up questions regarding their claim.
Feedback: Allow users to provide feedback on the claim process to help improve your services.

Implementation in Django (Next Steps after Claim Submission):

Redirect to a Confirmation Page:
- After the claim is successfully submitted, you can redirect the user to a confirmation page or display a message confirming that the claim was received.
Create a Status Page:
- You can implement a page where users can view the status of their claim and any additional steps.
Email Notification:
- Send an email notification to the user about the claim's successful submission and any next steps.

Example Django Workflow:

Views.py: After a claim is filed, the view can redirect to a status or confirmation page.
URLs.py: Define the URL for the claim status and confirmation.
Models.py: Add a status field in your Claim model (e.g., "Pending", "Under Review", "Approved", "Rejected").

Would you like help with the implementation or the next steps in Django? Let me know how you'd like to proceed!

{% extends 'core/base.html' %} {% block content %} <div class="container mt-5"> <h2 class="text-center">📋 Booking Management</h2> <table class="table table-bordered table-hover mt-3"> <thead class="table-dark"> <tr> <th>Name</th> <th>Service</th> <th>Date</th> <th>Status</th> <th>Actions</th> </tr> </thead> <tbody> {% for booking in bookings %} <tr> <td>{{ booking.name }}</td> <td>{{ booking.get_service_display }}</td> <td>{{ booking.date }}</td> <td> <span class="badge {% if booking.status == 'Approved' %}bg-success{% elif booking.status == 'Canceled' %}bg-danger{% else %}bg-warning{% endif %}"> {{ booking.status }} </span> </td> <td> <a href="{% url 'approve_booking' booking.id %}" class="btn btn-success btn-sm">Approve</a> <a href="{% url 'cancel_booking' booking.id %}" class="btn btn-danger btn-sm">Cancel</a> </td> </tr> {% endfor %} </tbody> </table> </div> {% endblock %} letds work on the admin dashboard

Yes! After approving a booking, the admin should assign a mechanic to handle the service. Here's how you can enhance your workflow:

Steps to Implement Mechanic Assignment

Modify the Booking Model
- Add a mechanic field (if not already present).
- Ensure only approved bookings can have a mechanic assigned.
Update the Admin View
- After approval, allow the admin to select a mechanic.
Create a Mechanic Assignment Page
- Show a dropdown list of available mechanics.

Example Implementation

1. Modify the Booking Model (`models.py`)

python
from django.db import models
from django.contrib.auth.models import User  # Assuming mechanics are users

class Booking(models.Model):
    STATUS_CHOICES = [
        ('Pending', 'Pending'),
        ('Approved', 'Approved'),
        ('Canceled', 'Canceled'),
        ('Completed', 'Completed'),
    ]
    
    name = models.CharField(max_length=255)
    service = models.CharField(max_length=255)
    date = models.DateField()
    status = models.CharField(max_length=10, choices=STATUS_CHOICES, default='Pending')
    mechanic = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, blank=True, limit_choices_to={'groups__name': 'Mechanics'})
    created_at = models.DateTimeField(auto_now_add=True)

2. Update the Admin View (`views.py`)

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.models import User
from .models import Booking

def approve_booking(request, booking_id):
    booking = get_object_or_404(Booking, id=booking_id)
    booking.status = 'Approved'
    booking.save()
    return redirect('assign_mechanic', booking_id=booking.id)

def assign_mechanic(request, booking_id):
    booking = get_object_or_404(Booking, id=booking_id, status='Approved')
    mechanics = User.objects.filter(groups__name='Mechanics')  # Fetch mechanics only

    if request.method == 'POST':
        mechanic_id = request.POST.get('mechanic')
        mechanic = get_object_or_404(User, id=mechanic_id)
        booking.mechanic = mechanic
        booking.save()
        return redirect('admin_bookings')

    return render(request, 'core/assign_mechanic.html', {'booking': booking, 'mechanics': mechanics})

3. Create Mechanic Assignment Template (`assign_mechanic.html`)

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2>Assign Mechanic for {{ booking.name }}</h2>

    <form method="post">
        {% csrf_token %}
        <div class="form-group">
            <label for="mechanic">Select Mechanic:</label>
            <select name="mechanic" class="form-control">
                {% for mechanic in mechanics %}
                    <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
                {% endfor %}
            </select>
        </div>
        <button type="submit" class="btn btn-primary mt-3">Assign Mechanic</button>
    </form>
</div>
{% endblock %}

4. Update the Admin Bookings Page (`admin_bookings.html`)

Modify the Actions column:

html
<td>
    {% if booking.status == 'Pending' %}
        <a href="{% url 'approve_booking' booking.id %}" class="btn btn-success btn-sm">Approve</a>
        <a href="{% url 'cancel_booking' booking.id %}" class="btn btn-danger btn-sm">Cancel</a>
    {% elif booking.status == 'Approved' and not booking.mechanic %}
        <a href="{% url 'assign_mechanic' booking.id %}" class="btn btn-warning btn-sm">Assign Mechanic</a>
    {% elif booking.mechanic %}
        <span class="badge bg-info">Assigned to {{ booking.mechanic.get_full_name }}</span>
    {% endif %}
</td>

Now the workflow is:

Admin approves a booking ✅
Admin assigns a mechanic 👨‍🔧
Mechanic receives the job 🔧
Status updates accordingly 🔄

Would you like any email notifications for the mechanic assignment? 📩

Great! After a mechanic is assigned, their dashboard should show all the jobs assigned to them. Here's how to implement that:

1. Update the Mechanic Dashboard View (`views.py`)

Modify the mechanic_dashboard function to display only jobs assigned to the logged-in mechanic.

python
from django.contrib.auth.decorators import login_required
from django.shortcuts import render
from .models import Booking

@login_required
def mechanic_dashboard(request):
    mechanic = request.user  # Get the logged-in mechanic
    bookings = Booking.objects.filter(mechanic=mechanic).order_by('-created_at')  # Fetch assigned jobs

    return render(request, 'core/mechanic_dashboard.html', {'bookings': bookings})

2. Create the Mechanic Dashboard Template (`mechanic_dashboard.html`)

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center">🔧 Mechanic Dashboard</h2>
    <p class="text-center">Welcome, {{ request.user.get_full_name }}! Here are your assigned jobs.</p>

    <table class="table table-bordered table-hover mt-3">
        <thead class="table-dark">
            <tr>
                <th>Customer</th>
                <th>Service</th>
                <th>Date</th>
                <th>Status</th>
                <th>Action</th>
            </tr>
        </thead>
        <tbody>
            {% for booking in bookings %}
            <tr>
                <td>{{ booking.name }}</td>
                <td>{{ booking.get_service_display }}</td>
                <td>{{ booking.date }}</td>
                <td>
                    <span class="badge {% if booking.status == 'Approved' %}bg-warning{% elif booking.status == 'Completed' %}bg-success{% else %}bg-info{% endif %}">
                        {{ booking.status }}
                    </span>
                </td>
                <td>
                    {% if booking.status == 'Approved' %}
                        <a href="{% url 'mark_completed' booking.id %}" class="btn btn-success btn-sm">Mark as Completed</a>
                    {% else %}
                        <span class="text-muted">No Action</span>
                    {% endif %}
                </td>
            </tr>
            {% empty %}
            <tr>
                <td colspan="5" class="text-center">No jobs assigned yet.</td>
            </tr>
            {% endfor %}
        </tbody>
    </table>
</div>
{% endblock %}

3. Add a "Mark as Completed" Feature

After completing the job, the mechanic should be able to update the status.

Update View (`views.py`)

python
from django.shortcuts import redirect, get_object_or_404
from django.contrib.auth.decorators import login_required

@login_required
def mark_completed(request, booking_id):
    booking = get_object_or_404(Booking, id=booking_id, mechanic=request.user)
    booking.status = 'Completed'
    booking.save()
    return redirect('mechanic_dashboard')

4. Update URLs (`urls.py`)

python
from django.urls import path
from .views import mechanic_dashboard, mark_completed

urlpatterns = [
    path('mechanic/dashboard/', mechanic_dashboard, name='mechanic_dashboard'),
    path('mechanic/mark_completed/<int:booking_id>/', mark_completed, name='mark_completed'),
]

5. Add a Dashboard Link for Mechanics

Modify the navbar (base.html) so mechanics can access their dashboard easily.

html
{% if request.user.groups.all.0.name == 'Mechanics' %}
    <li class="nav-item">
        <a class="nav-link" href="{% url 'mechanic_dashboard' %}">Mechanic Dashboard</a>
    </li>
{% endif %}

Now the Workflow is:

Admin assigns a mechanic ✅
Mechanic sees assigned jobs in their dashboard 👨‍🔧
Mechanic marks jobs as completed 🔧
Status updates on both dashboards 🔄

Would you like to add notifications or emails when a new job is assigned? 📩

from django.shortcuts import render,redirect,get_object_or_404 from django.contrib import messages from django.contrib.auth.decorators import login_required from django.contrib.auth.models import User from .forms import * from .models import * # Create your views here. def home(request): # Check if the user is part of the 'Mechanic' group is_mechanic = request.user.groups.filter(name='Mechanic').exists() return render(request, 'core/home.html', {'is_mechanic': is_mechanic}) def admin_bookings(request): bookings = Booking.objects.all().order_by('-created_at') return render(request, 'core/admin_bookings.html', {'bookings': bookings}) def approve_booking(request, booking_id): booking = get_object_or_404(Booking, id=booking_id) booking.status = 'Approved' booking.save() return redirect('admin_bookings') def cancel_booking(request, booking_id): booking = get_object_or_404(Booking, id=booking_id) booking.status = 'Canceled' booking.save() return redirect('admin_bookings') def booking_view(request): if request.method == "POST": form = BookingForm(request.POST) if form.is_valid(): form.save() messages.success(request, "✅ Your booking has been successfully submitted!") return redirect('booking') # Redirect to the same page after success else: form = BookingForm() return render(request, 'core/booking.html', {'form': form}) @login_required def update_booking_status(request, booking_id): booking = get_object_or_404(Booking, id=booking_id) if request.user != booking.mechanic: return redirect('booking_list') # Prevent unauthorized access if request.method == 'POST': form = UpdateBookingStatusForm(request.POST, instance=booking) if form.is_valid(): form.save() return redirect('booking_list') else: form = UpdateBookingStatusForm(instance=booking) return render(request, 'update_booking_status.html', {'form': form, 'booking': booking}) @login_required def mechanic_dashboard(request): # Check if the user is part of the 'Mechanic' group if not request.user.groups.filter(name='Mechanic').exists(): print("User is not in 'Mechanic' group") # Debugging output return redirect('home') # If the user is a mechanic, fetch assigned bookings assigned_bookings = Booking.objects.filter(mechanic=request.user) print(f"Assigned bookings: {assigned_bookings}") # Debugging output return render(request, 'mechanic_dashboard.html', {'assigned_bookings': assigned_bookings}) def service_list(request): services = Service.objects.all() return render(request, 'core/service_list.html', {'services': services}) here are the views i had already created now lets work from there

Great! Now let's extend your admin booking system to allow the admin to assign mechanics to jobs and ensure assigned jobs appear on the mechanic dashboard.

1. Update the `Booking` Model

Make sure your Booking model has a mechanic field.

python
from django.db import models
from django.contrib.auth.models import User

class Booking(models.Model):
    STATUS_CHOICES = [
        ('Pending', 'Pending'),
        ('Approved', 'Approved'),
        ('Canceled', 'Canceled'),
        ('Completed', 'Completed'),
    ]

    name = models.CharField(max_length=255)
    service = models.ForeignKey('Service', on_delete=models.CASCADE)
    date = models.DateField()
    mechanic = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, blank=True, limit_choices_to={'groups__name': "Mechanic"})
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='Pending')
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.name} - {self.service} ({self.status})"

2. Create an Assign Mechanic Form

In forms.py, add a new form to allow admin to assign a mechanic.

python
from django import forms
from django.contrib.auth.models import User
from .models import Booking

class AssignMechanicForm(forms.ModelForm):
    mechanic = forms.ModelChoiceField(queryset=User.objects.filter(groups__name="Mechanic"), required=True, label="Assign Mechanic")

    class Meta:
        model = Booking
        fields = ['mechanic']

3. Add Assign Mechanic Feature to `admin_bookings`

Modify your admin_bookings view to handle mechanic assignments.

Update `views.py`

python
def admin_bookings(request):
    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')
        
        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(User, id=mechanic_id)
        
        booking.mechanic = mechanic
        booking.status = 'Approved'  # Automatically approve when assigning
        booking.save()
        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")

        return redirect('admin_bookings')

    mechanics = User.objects.filter(groups__name="Mechanic")  # Fetch all mechanics
    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

4. Update Admin Bookings Template (`admin_bookings.html`)

Modify the booking list to allow mechanic assignment.

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center">📋 Admin - Manage Bookings</h2>

    <table class="table table-bordered table-hover mt-3">
        <thead class="table-dark">
            <tr>
                <th>Name</th>
                <th>Service</th>
                <th>Date</th>
                <th>Status</th>
                <th>Assigned Mechanic</th>
                <th>Actions</th>
            </tr>
        </thead>
        <tbody>
            {% for booking in bookings %}
            <tr>
                <td>{{ booking.name }}</td>
                <td>{{ booking.get_service_display }}</td>
                <td>{{ booking.date }}</td>
                <td>
                    <span class="badge {% if booking.status == 'Approved' %}bg-warning{% elif booking.status == 'Completed' %}bg-success{% else %}bg-danger{% endif %}">
                        {{ booking.status }}
                    </span>
                </td>
                <td>
                    {% if booking.mechanic %}
                        {{ booking.mechanic.get_full_name }}
                    {% else %}
                        <form method="post">
                            {% csrf_token %}
                            <input type="hidden" name="booking_id" value="{{ booking.id }}">
                            <select name="mechanic_id" class="form-select form-select-sm">
                                <option value="" disabled selected>Assign Mechanic</option>
                                {% for mechanic in mechanics %}
                                    <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
                                {% endfor %}
                            </select>
                            <button type="submit" class="btn btn-primary btn-sm mt-2">Assign</button>
                        </form>
                    {% endif %}
                </td>
                <td>
                    <a href="{% url 'approve_booking' booking.id %}" class="btn btn-success btn-sm">Approve</a>
                    <a href="{% url 'cancel_booking' booking.id %}" class="btn btn-danger btn-sm">Cancel</a>
                </td>
            </tr>
            {% empty %}
            <tr>
                <td colspan="6" class="text-center">No bookings found.</td>
            </tr>
            {% endfor %}
        </tbody>
    </table>
</div>
{% endblock %}

5. Mechanic Dashboard Updates

Modify the mechanic_dashboard so mechanics only see jobs assigned to them.

Update `views.py`

python
@login_required
def mechanic_dashboard(request):
    if not request.user.groups.filter(name='Mechanic').exists():
        return redirect('home')

    assigned_bookings = Booking.objects.filter(mechanic=request.user, status='Approved')
    return render(request, 'core/mechanic_dashboard.html', {'assigned_bookings': assigned_bookings})

Update `mechanic_dashboard.html`

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center">🔧 Mechanic Dashboard</h2>
    <p class="text-center">Welcome, {{ request.user.get_full_name }}! Here are your assigned jobs.</p>

    <table class="table table-bordered table-hover mt-3">
        <thead class="table-dark">
            <tr>
                <th>Customer</th>
                <th>Service</th>
                <th>Date</th>
                <th>Status</th>
                <th>Action</th>
            </tr>
        </thead>
        <tbody>
            {% for booking in assigned_bookings %}
            <tr>
                <td>{{ booking.name }}</td>
                <td>{{ booking.get_service_display }}</td>
                <td>{{ booking.date }}</td>
                <td>
                    <span class="badge {% if booking.status == 'Approved' %}bg-warning{% elif booking.status == 'Completed' %}bg-success{% else %}bg-info{% endif %}">
                        {{ booking.status }}
                    </span>
                </td>
                <td>
                    <a href="{% url 'mark_completed' booking.id %}" class="btn btn-success btn-sm">Mark as Completed</a>
                </td>
            </tr>
            {% empty %}
            <tr>
                <td colspan="5" class="text-center">No jobs assigned yet.</td>
            </tr>
            {% endfor %}
        </tbody>
    </table>
</div>
{% endblock %}

6. Mark Booking as Completed

Add `mark_completed` View

python
@login_required
def mark_completed(request, booking_id):
    booking = get_object_or_404(Booking, id=booking_id, mechanic=request.user)
    booking.status = 'Completed'
    booking.save()
    messages.success(request, "✅ Job marked as completed!")
    return redirect('mechanic_dashboard')

Update `urls.py`

python
urlpatterns = [
    path('admin/bookings/', admin_bookings, name='admin_bookings'),
    path('mechanic/dashboard/', mechanic_dashboard, name='mechanic_dashboard'),
    path('mechanic/mark_completed/<int:booking_id>/', mark_completed, name='mark_completed'),
]

Now the Workflow is:

✅ Admin can assign a mechanic from the admin bookings page.
✅ Mechanic sees assigned jobs on their dashboard.
✅ Mechanic can mark jobs as completed once done.
✅ Status updates on both dashboards dynamically.

Do you also want email notifications when a mechanic is assigned? 📩

class Booking(models.Model): SERVICE_CHOICES = [ ('oil_change', 'Oil Change'), ('brake_check', 'Brake Check'), ('tire_replacement', 'Tire Replacement'), ('engine_diagnosis', 'Engine Diagnosis'), ] STATUS_CHOICES = [ ('pending', 'Pending'), ('approved', 'Approved'), ('in_progress', 'In Progress'), ('completed', 'Completed'), ('cancelled', 'Cancelled'), ] name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) service = models.CharField(max_length=50, choices=SERVICE_CHOICES) date = models.DateField() message = models.TextField(blank=True, null=True) status = models.CharField(max_length=11, choices=STATUS_CHOICES, default='pending') mechanic = models.ForeignKey( settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True ) created_at = models.DateTimeField(auto_now_add=True) def __str__(self): return f"{self.name} - {self.service} on {self.date}" here is my booking

Your Booking model looks great! Now, let's make sure that:

✅ Admins can assign mechanics to bookings.
✅ Mechanics see assigned jobs on their dashboard.
✅ Mechanics can update job status (e.g., from "In Progress" to "Completed").
✅ Status updates are reflected in both dashboards.

1. Allow Admins to Assign Mechanics

We'll modify the admin_bookings view to handle mechanic assignments.

Update `views.py`

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.contrib.auth.models import User
from django.conf import settings
from .models import Booking
from .forms import AssignMechanicForm

@login_required
def admin_bookings(request):
    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')
        
        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(User, id=mechanic_id)
        
        booking.mechanic = mechanic
        booking.status = 'approved'  # Automatically approve when assigning
        booking.save()
        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")

        return redirect('admin_bookings')

    mechanics = User.objects.filter(groups__name="Mechanic")  # Fetch all mechanics
    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

2. Update Admin Bookings Template

We'll add a dropdown for assigning mechanics.

Update `admin_bookings.html`

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center">📋 Admin - Manage Bookings</h2>

    <table class="table table-bordered table-hover mt-3">
        <thead class="table-dark">
            <tr>
                <th>Name</th>
                <th>Service</th>
                <th>Date</th>
                <th>Status</th>
                <th>Assigned Mechanic</th>
                <th>Actions</th>
            </tr>
        </thead>
        <tbody>
            {% for booking in bookings %}
            <tr>
                <td>{{ booking.name }}</td>
                <td>{{ booking.get_service_display }}</td>
                <td>{{ booking.date }}</td>
                <td>
                    <span class="badge {% if booking.status == 'approved' %}bg-warning{% elif booking.status == 'completed' %}bg-success{% else %}bg-danger{% endif %}">
                        {{ booking.status }}
                    </span>
                </td>
                <td>
                    {% if booking.mechanic %}
                        {{ booking.mechanic.get_full_name }}
                    {% else %}
                        <form method="post">
                            {% csrf_token %}
                            <input type="hidden" name="booking_id" value="{{ booking.id }}">
                            <select name="mechanic_id" class="form-select form-select-sm">
                                <option value="" disabled selected>Assign Mechanic</option>
                                {% for mechanic in mechanics %}
                                    <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
                                {% endfor %}
                            </select>
                            <button type="submit" class="btn btn-primary btn-sm mt-2">Assign</button>
                        </form>
                    {% endif %}
                </td>
                <td>
                    <a href="{% url 'cancel_booking' booking.id %}" class="btn btn-danger btn-sm">Cancel</a>
                </td>
            </tr>
            {% empty %}
            <tr>
                <td colspan="6" class="text-center">No bookings found.</td>
            </tr>
            {% endfor %}
        </tbody>
    </table>
</div>
{% endblock %}

3. Update Mechanic Dashboard

Mechanics should see only their assigned jobs.

Update `views.py`

python
@login_required
def mechanic_dashboard(request):
    if not request.user.groups.filter(name='Mechanic').exists():
        return redirect('home')

    assigned_bookings = Booking.objects.filter(mechanic=request.user, status='approved')
    return render(request, 'core/mechanic_dashboard.html', {'assigned_bookings': assigned_bookings})

Update `mechanic_dashboard.html`

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center">🔧 Mechanic Dashboard</h2>
    <p class="text-center">Welcome, {{ request.user.get_full_name }}! Here are your assigned jobs.</p>

    <table class="table table-bordered table-hover mt-3">
        <thead class="table-dark">
            <tr>
                <th>Customer</th>
                <th>Service</th>
                <th>Date</th>
                <th>Status</th>
                <th>Action</th>
            </tr>
        </thead>
        <tbody>
            {% for booking in assigned_bookings %}
            <tr>
                <td>{{ booking.name }}</td>
                <td>{{ booking.get_service_display }}</td>
                <td>{{ booking.date }}</td>
                <td>
                    <span class="badge {% if booking.status == 'approved' %}bg-warning{% elif booking.status == 'completed' %}bg-success{% else %}bg-info{% endif %}">
                        {{ booking.status }}
                    </span>
                </td>
                <td>
                    <a href="{% url 'mark_completed' booking.id %}" class="btn btn-success btn-sm">Mark as Completed</a>
                </td>
            </tr>
            {% empty %}
            <tr>
                <td colspan="5" class="text-center">No jobs assigned yet.</td>
            </tr>
            {% endfor %}
        </tbody>
    </table>
</div>
{% endblock %}

4. Mechanic Can Mark Jobs as Completed

Add `mark_completed` View

python
@login_required
def mark_completed(request, booking_id):
    booking = get_object_or_404(Booking, id=booking_id, mechanic=request.user)
    booking.status = 'completed'
    booking.save()
    messages.success(request, "✅ Job marked as completed!")
    return redirect('mechanic_dashboard')

Update `urls.py`

python
from django.urls import path
from .views import *

urlpatterns = [
    path('admin/bookings/', admin_bookings, name='admin_bookings'),
    path('mechanic/dashboard/', mechanic_dashboard, name='mechanic_dashboard'),
    path('mechanic/mark_completed/<int:booking_id>/', mark_completed, name='mark_completed'),
]

Now the Workflow is:

✅ Admin can assign a mechanic from the admin dashboard.
✅ Mechanic sees assigned jobs on their dashboard.
✅ Mechanic can update job status (e.g., mark as completed).
✅ Status updates on both dashboards dynamically.

Bonus: Do You Want Email Notifications? 📩

I can also help you send an email notification when:

A mechanic is assigned to a job
A job is marked as completed

Let me know if you'd like to add that! 🚀

AttributeError at /manage/bookings/ Manager isn't available; 'auth.User' has been swapped for 'accounts.CustomUser' Request Method: GET Request URL: http://127.0.0.1:8000/manage/bookings/ Django Version: 5.1.7 Exception Type: AttributeError Exception Value: Manager isn't available; 'auth.User' has been swapped for 'accounts.CustomUser' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py, line 196, in __get__ Raised during: core.views.admin_bookings Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 07:24:34 +0000

This error occurs because Django's default auth.User model has been swapped with your custom user model (accounts.CustomUser), and some queries are still expecting auth.User.

How to Fix It

Check these areas in your code:

1. Update Queries Referencing `User`

Anywhere in your views, if you are using:

python
from django.contrib.auth.models import User

Change it to:

python
from django.contrib.auth import get_user_model

User = get_user_model()

Now, User will correctly refer to accounts.CustomUser.

2. Ensure Custom User Model is Defined in `settings.py`

Make sure your settings.py contains:

python
AUTH_USER_MODEL = 'accounts.CustomUser'

3. Check Model Relationships

In your Booking model, if you have:

python
mechanic = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, blank=True)

Change it to:

python
from django.contrib.auth import get_user_model

User = get_user_model()

class Booking(models.Model):
    mechanic = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, blank=True)

Try These Fixes and Restart Your Server

After making these changes, restart your Django server:

sh
python manage.py runserver

Let me know if the issue persists! 🚀

@login_required def admin_bookings(request): bookings = Booking.objects.all().order_by('-created_at') if request.method == "POST": booking_id = request.POST.get('booking_id') mechanic_id = request.POST.get('mechanic_id') booking = get_object_or_404(Booking, id=booking_id) mechanic = get_object_or_404(User, id=mechanic_id) booking.mechanic = mechanic booking.status = 'approved' # Automatically approve when assigning booking.save() messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!") return redirect('admin_bookings') mechanics = User.objects.filter(groups__name="Mechanic") # Fetch all mechanics return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

Your approach is mostly correct, but since you are using a custom user model (accounts.CustomUser), you need to replace User with get_user_model() in your admin_bookings view.

Fixed Version:

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.contrib.auth import get_user_model
from .models import Booking

User = get_user_model()  # Ensure we use the custom user model

@login_required
def admin_bookings(request):
    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')
        
        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(User, id=mechanic_id)
        
        booking.mechanic = mechanic
        booking.status = 'approved'  # Automatically approve when assigning
        booking.save()
        
        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")

        return redirect('admin_bookings')

    mechanics = User.objects.filter(groups__name="Mechanic")  # Fetch all mechanics

    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

Why This Fix Works:

✅ Uses get_user_model() instead of directly referencing User, preventing issues related to your CustomUser model.
✅ Ensures Assigned Mechanic Appears in the Mechanic Dashboard
- Since booking.mechanic = mechanic is set, the mechanic will see the booking in their dashboard.

Next Step: Show Assigned Bookings in Mechanic Dashboard

Modify the mechanic dashboard view to only show assigned bookings:

python
@login_required
def mechanic_dashboard(request):
    if not request.user.groups.filter(name='Mechanic').exists():
        return redirect('home')

    # Fetch bookings assigned to the logged-in mechanic
    assigned_bookings = Booking.objects.filter(mechanic=request.user)

    return render(request, 'core/mechanic_dashboard.html', {'assigned_bookings': assigned_bookings})

Let Me Know if You Need More Fixes! 🚀

@login_required def mechanic_dashboard(request): # Check if the user is part of the 'Mechanic' group if not request.user.groups.filter(name='Mechanic').exists(): print("User is not in 'Mechanic' group") # Debugging output return redirect('home') # If the user is a mechanic, fetch assigned bookings assigned_bookings = Booking.objects.filter(mechanic=request.user) print(f"Assigned bookings: {assigned_bookings}") # Debugging output return render(request, 'mechanic_dashboard.html', {'assigned_bookings': assigned_bookings}) this is my mechanic dashboard view

Your mechanic_dashboard view looks good! However, if the assigned bookings are not appearing on the mechanic's dashboard, let's verify a few things:

✅ Checklist to Ensure Assigned Bookings Appear:

Confirm Mechanics Are Assigned to Bookings
- Check in Django Admin or the database if mechanic is correctly set in Booking.
Check the Booking Query in View
- You are using Booking.objects.filter(mechanic=request.user), which is correct.
- If no bookings appear, print the request.user.id and manually check in the database:
```
python
print(f"Logged-in mechanic: {request.user.id}")  # Debugging
print(f"Assigned bookings: {list(assigned_bookings)}")  # Debugging
```

Ensure Mechanics Have the Right Group

Run this query in Django shell (python manage.py shell):

python
from django.contrib.auth import get_user_model
User = get_user_model()
user = User.objects.get(username='mechanic_username')  # Replace with actual mechanic username
print(user.groups.all())  # Check if the user is in 'Mechanic' group

Modify Mechanic Dashboard Template (mechanic_dashboard.html)

If bookings exist but don't show up, ensure your template correctly iterates over assigned_bookings:

html
{% for booking in assigned_bookings %}
    <tr>
        <td>{{ booking.name }}</td>
        <td>{{ booking.get_service_display }}</td>
        <td>{{ booking.date }}</td>
        <td>{{ booking.status }}</td>
    </tr>
{% empty %}
    <tr><td colspan="4">No assigned bookings.</td></tr>
{% endfor %}

🛠️ Next Steps

Run the debugging checks.
If everything looks fine but still doesn't work, share any error messages or unexpected behavior. 🚀

Assigning a Mechanic: Expected Behavior

When an admin assigns a mechanic to a booking:

The admin selects a mechanic from the dropdown.
The form is submitted via POST.
The server processes the request:
- Retrieves the selected mechanic.
- Updates the booking by setting the mechanic and changing the status to "approved."
- Saves the changes.
- Redirects back to the admin dashboard with a success message.
The assigned mechanic’s name should now appear instead of the dropdown.
The assigned booking should now appear on the mechanic's dashboard.

🚀 Steps to Ensure This Works

✅ 1. Update the `admin_bookings` View

Make sure the backend properly processes the mechanic assignment:

python
@login_required
def admin_bookings(request):
    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)  # Use CustomUser instead of User

        booking.mechanic = mechanic
        booking.status = 'approved'  # Auto-approve when assigning a mechanic
        booking.save()
        
        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")
        return redirect('admin_bookings')

    mechanics = CustomUser.objects.filter(groups__name="Mechanic")  # Get all mechanics
    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

✅ 2. Update the Mechanic's Dashboard View

Ensure mechanics see their assigned bookings:

python
@login_required
def mechanic_dashboard(request):
    if not request.user.groups.filter(name='Mechanic').exists():
        messages.error(request, "You do not have permission to access this page.")
        return redirect('home')

    assigned_bookings = Booking.objects.filter(mechanic=request.user)

    return render(request, 'core/mechanic_dashboard.html', {'assigned_bookings': assigned_bookings})

✅ 3. Fix the Mechanic Assignment in `admin_bookings.html`

When a mechanic is assigned, replace the dropdown with their name.

Updated Mechanic Column in Table:

html
<td>
    {% if booking.mechanic %}
        {{ booking.mechanic.get_full_name }}
    {% else %}
        <form method="post">
            {% csrf_token %}
            <input type="hidden" name="booking_id" value="{{ booking.id }}">
            <select name="mechanic_id" class="form-select form-select-sm" required>
                <option value="" disabled selected>Assign Mechanic</option>
                {% for mechanic in mechanics %}
                    <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
                {% endfor %}
            </select>
            <button type="submit" class="btn btn-primary btn-sm mt-2">Assign</button>
        </form>
    {% endif %}
</td>

🛠️ Debugging & Verification

Assign a mechanic and check:
- Does the dropdown disappear and show the assigned mechanic's name?
- Does the booking status change to "approved"?
- Do you see a success message?
Login as a mechanic and verify:
- Does the booking appear on the mechanic's dashboard?

🎯 Expected Outcome

The admin assigns a mechanic successfully.
The mechanic sees their assigned bookings.
The status updates properly.

Try this out and let me know if anything doesn't work as expected! 🚀

Yes! Since you're using a custom user model (CustomUser instead of Django's default User), you need to import it in your views.

✅ Import `CustomUser` in `views.py`

At the top of views.py, add:

python
from django.contrib.auth import get_user_model

CustomUser = get_user_model()  # This ensures you're using the correct custom user model

OR, if your CustomUser model is in accounts.models, import it directly:

python
from accounts.models import CustomUser

✅ Update Mechanic Queries

Modify your queries to use CustomUser instead of User:

python
mechanic = get_object_or_404(CustomUser, id=mechanic_id)  
mechanics = CustomUser.objects.filter(groups__name="Mechanic")

This ensures you're working with the correct custom user model instead of Django’s default auth.User.

🚀 Summary

Import CustomUser properly.
Replace User with CustomUser in all queries.
Test the mechanic assignment to verify everything works.

Try it and let me know if you run into any issues! 🚀

Let's debug and fix the issue step by step.

✅ Check if the View is Handling the POST Request

Your admin_bookings view should be handling the mechanic assignment correctly. Verify that the request method is actually POST when the button is clicked.

Modify `admin_bookings` to Add Debugging Prints

Update your view to print out debugging information:

python
@login_required
def admin_bookings(request):
    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        print("✅ POST request received!")  # Debugging Output
        
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}")  # Debugging Output

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        # Ensure using the correct user model
        from django.contrib.auth import get_user_model
        CustomUser = get_user_model()

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)

        booking.mechanic = mechanic
        booking.status = 'approved'  # Automatically approve when assigning
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")

        return redirect('admin_bookings')

    # Fetch mechanics properly
    from django.contrib.auth.models import Group
    mechanics = CustomUser.objects.filter(groups__name="Mechanic")

    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

✅ Ensure the Form is Submitting Data

Check if the Assign Mechanic dropdown sends data correctly.

Modify the Form:

html
<form method="post">
    {% csrf_token %}
    <input type="hidden" name="booking_id" value="{{ booking.id }}">
    <select name="mechanic_id" class="form-select form-select-sm">
        <option value="" disabled selected>Assign Mechanic</option>
        {% for mechanic in mechanics %}
            <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
        {% endfor %}
    </select>
    <button type="submit" class="btn btn-primary btn-sm mt-2">Assign</button>
</form>

Hidden input ensures that the booking ID is passed.
Check if options are rendering correctly (<option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>).
Ensure mechanic_id is sent in the request.

✅ Verify URL in `urls.py`

Ensure the URL pattern for admin_bookings is correctly defined in urls.py:

python
path('admin/bookings/', views.admin_bookings, name='admin_bookings'),

Make sure the name is exactly admin_bookings if you're using redirect('admin_bookings').

✅ Check Browser Console & Network Activity

Open Developer Tools (F12 in Chrome/Edge or Cmd+Opt+I in Mac).
Go to the "Network" tab.
Click "Assign" and see if a POST request is being made.
Go to the "Console" tab and check for JavaScript errors.

✅ Final Testing

Restart the Django server (Ctrl+C and python manage.py runserver).
Try assigning a mechanic.
Check the console logs (Django shell and browser DevTools).
Confirm if the mechanic is correctly saved in the database.

If the issue persists, let me know what prints appear in your terminal after clicking "Assign"! 🚀

UnboundLocalError at /manage/bookings/ cannot access local variable 'CustomUser' where it is not associated with a value Request Method: GET Request URL: http://127.0.0.1:8000/manage/bookings/ Django Version: 5.1.7 Exception Type: UnboundLocalError Exception Value: cannot access local variable 'CustomUser' where it is not associated with a value Exception Location: C:\Users\lau\Desktop\Projects\garage_system\core\views.py, line 51, in admin_bookings Raised during: core.views.admin_bookings Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 07:39:31 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\auth\decorators.py, line 60, in _view_wrapper return view_func(request, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\core\views.py, line 51, in admin_bookings mechanics = CustomUser.objects.filter(groups__name="Mechanic")

The error "UnboundLocalError: cannot access local variable 'CustomUser' where it is not associated with a value" occurs because CustomUser is only defined inside the if request.method == "POST" block, making it unavailable when handling GET requests.

✅ Fix: Move `CustomUser` Import to the Top of `admin_bookings`

Modify `admin_bookings` in `views.py`

python
from django.shortcuts import render, get_object_or_404, redirect
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.contrib.auth import get_user_model
from .models import Booking

@login_required
def admin_bookings(request):
    CustomUser = get_user_model()  # ✅ Ensure this is available for both GET & POST requests

    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        print("✅ POST request received!")  # Debugging Output

        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}")  # Debugging Output

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)

        booking.mechanic = mechanic
        booking.status = 'approved'  # Automatically approve when assigning
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")

        return redirect('admin_bookings')

    # ✅ Fetch mechanics outside the if block so it's available for GET requests too
    mechanics = CustomUser.objects.filter(groups__name="Mechanic")

    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

✅ Why This Fix Works

Moves CustomUser = get_user_model() outside the if block
- Now, it's available for both POST and GET requests.
Ensures the correct user model is used
- Since auth.User has been swapped for accounts.CustomUser, we must use get_user_model().
Properly fetches mechanics
- If you were using User.objects.filter(groups__name="Mechanic"), it would have failed because User is not the model anymore.

✅ Next Steps:

Restart your Django server (Ctrl+C then python manage.py runserver).
Try accessing /manage/bookings/ again.
Click "Assign Mechanic" and check if it works.
Let me know if you still get issues! 🚀

The issue is that mechanic_id is coming through as None, which means the mechanic selection is not being sent properly in the form.

✅ Debugging & Fix

1️⃣ Add Debugging to Check Form Submission

Modify your admin_bookings view to print request.POST:

python
if request.method == "POST":
    print("✅ POST request received!")
    print(f"📩 Form Data: {request.POST}")  # Debugging Output
    
    booking_id = request.POST.get('booking_id')
    mechanic_id = request.POST.get('mechanic_id')

    print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}")  # Debugging Output

    if not booking_id or not mechanic_id:
        messages.error(request, "❌ Please select a mechanic!")
        return redirect('admin_bookings')

2️⃣ Check Your HTML Form (Fix Select Input)

Update your admin_bookings.html:

html
<form method="post">
    {% csrf_token %}
    <input type="hidden" name="booking_id" value="{{ booking.id }}">
    
    <select name="mechanic_id" class="form-select form-select-sm" required>
        <option value="" selected disabled>Assign Mechanic</option>
        {% for mechanic in mechanics %}
            <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
        {% endfor %}
    </select>

    <button type="submit" class="btn btn-primary btn-sm mt-2">Assign</button>
</form>

✅ Why This Fix Works

Debugging will show if mechanic_id is missing.
- If it's not appearing in request.POST, then there's an issue with the form submission.
Adding required ensures a mechanic is selected before submitting.
Ensuring the <option> values are correctly set.

Next Steps

Try assigning a mechanic again.
Check if mechanic_id is still None.
Let me know what 📩 Form Data: {request.POST} prints! 🚀

@login_required def admin_bookings(request): CustomUser = get_user_model() # ✅ Ensure this is available for both GET & POST requests bookings = Booking.objects.all().order_by('-created_at') if request.method == "POST": print("✅ POST request received!") # Debugging Output booking_id = request.POST.get('booking_id') mechanic_id = request.POST.get('mechanic_id') print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}") # Debugging Output if not booking_id or not mechanic_id: messages.error(request, "❌ Please select a mechanic!") return redirect('admin_bookings') booking = get_object_or_404(Booking, id=booking_id) mechanic = get_object_or_404(CustomUser, id=mechanic_id) booking.mechanic = mechanic booking.status = 'approved' # Automatically approve when assigning booking.save() messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!") return redirect('admin_bookings') # ✅ Fetch mechanics outside the if block so it's available for GET requests too mechanics = CustomUser.objects.filter(groups__name="Mechanic") return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics}) add if request.method == "POST": print("✅ POST request received!") print(f"📩 Form Data: {request.POST}") # Debugging Output booking_id = request.POST.get('booking_id') mechanic_id = request.POST.get('mechanic_id') print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}") # Debugging Output if not booking_id or not mechanic_id: messages.error(request, "❌ Please select a mechanic!") return redirect('admin_bookings')

It looks like you want to add extra debugging output inside your POST request handling. Here’s your updated view with the additional debugging code:

✅ Updated `admin_bookings` View

python
@login_required
def admin_bookings(request):
    CustomUser = get_user_model()  # ✅ Ensure CustomUser is available for both GET & POST requests

    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        print("✅ POST request received!")  # Debugging Output
        print(f"📩 Form Data: {request.POST}")  # Debugging Output

        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}")  # Debugging Output

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        # Fetch the booking and mechanic
        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)

        # Assign mechanic and update status
        booking.mechanic = mechanic
        booking.status = 'approved'  # Automatically approve when assigning
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")

        return redirect('admin_bookings')

    # ✅ Fetch mechanics outside the if block so it's available for GET requests too
    mechanics = CustomUser.objects.filter(groups__name="Mechanic")

    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

✅ What's New?

Extra Debugging
- Logs all form data when a POST request is received.
- Shows booking_id and mechanic_id values.
Ensured CustomUser is Defined Before Filtering Mechanics
- Moved get_user_model() outside the if block so it's always available.

✅ Next Steps

Try assigning a mechanic and check the console logs.
If mechanic_id is still None, there may be a form issue in your HTML.

Let me know if you need further debugging! 🚀

[31/Mar/2025 10:46:15] "GET /manage/bookings/ HTTP/1.1" 200 5583 ✅ POST request received! 📩 Form Data: <QueryDict: {'csrfmiddlewaretoken': ['HaglAZjluuefE4d5yryQj91TPysHWFs8IFbk5XmYOBwhVYNhv6gZynxerT8cLDPR'], 'booking_id': ['1']}> 🔹 Booking ID: 1, Mechanic ID: None [31/Mar/2025 10:46:17] "POST /manage/bookings/ HTTP/1.1" 302 0 [31/Mar/2025 10:46:17] "GET /manage/bookings/ HTTP/1.1" 200 5583

🚨 Issue Identified: `mechanic_id` is `None`

Your logs show that the mechanic_id is not being passed in the form submission:

yaml
📩 Form Data: <QueryDict: {'csrfmiddlewaretoken': [...], 'booking_id': ['1']}>
🔹 Booking ID: 1, Mechanic ID: None

This means the <select> dropdown is not sending a value when you submit the form.

✅ Fix the Form in `admin_bookings.html`

Update your mechanic selection form inside the table:

html
<form method="post">
    {% csrf_token %}
    <input type="hidden" name="booking_id" value="{{ booking.id }}">
    
    <select name="mechanic_id" class="form-select form-select-sm" required>
        <option value="" disabled selected>Assign Mechanic</option>
        {% for mechanic in mechanics %}
            <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
        {% endfor %}
    </select>

    <button type="submit" class="btn btn-primary btn-sm mt-2">Assign</button>
</form>

🔹 What's Fixed?

Added required to <select>
- Ensures a mechanic is selected before submitting the form.
Confirmed the name="mechanic_id" is Correct
- This ensures Django's request.POST.get("mechanic_id") retrieves the correct value.
Checked for Dynamic Options
- {% for mechanic in mechanics %} properly loops over mechanics.

✅ Next Steps

Restart the Server (if needed)
Try Assigning a Mechanic Again

Check the Logs

You should now see:

yaml
📩 Form Data: <QueryDict: {'csrfmiddlewaretoken': [...], 'booking_id': ['1'], 'mechanic_id': ['2']}>
🔹 Booking ID: 1, Mechanic ID: 2

If mechanic_id is still missing, inspect the HTML form using Developer Tools (F12 > Elements tab) to ensure the <select> field exists.

Let me know what happens! 🚀

Your template looks well-structured, but there are a few potential issues that might be causing the mechanic_id to be missing when submitting the form. Below are the fixes and improvements to ensure it works correctly.

✅ Fix & Improvements

Ensure name="mechanic_id" is always set
- The select field must always have a valid value before submitting.
Ensure form actually submits data
- Forms inside a table must have a submit action; otherwise, they may not work as expected.
Wrap form with a <td> for better structure.
- Keeping <form> inside <td> improves readability and avoids HTML parsing issues.

🔹 Updated Template

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center">📊 Admin Dashboard</h2>

    <!-- Overview Cards -->
    <div class="row text-center mt-4">
        <div class="col-md-4">
            <div class="card text-white bg-success mb-3">
                <div class="card-body">
                    <h5 class="card-title">Approved Bookings</h5>
                    <h3>{{ approved_count }}</h3>
                </div>
            </div>
        </div>
        <div class="col-md-4">
            <div class="card text-white bg-warning mb-3">
                <div class="card-body">
                    <h5 class="card-title">Pending Bookings</h5>
                    <h3>{{ pending_count }}</h3>
                </div>
            </div>
        </div>
        <div class="col-md-4">
            <div class="card text-white bg-danger mb-3">
                <div class="card-body">
                    <h5 class="card-title">Canceled Bookings</h5>
                    <h3>{{ canceled_count }}</h3>
                </div>
            </div>
        </div>
    </div>

    <!-- Booking Management Table -->
    <div class="card mt-4">
        <div class="card-header bg-dark text-white text-center">
            <h5>Booking Management</h5>
        </div>
        <div class="card-body">
            <table class="table table-bordered table-hover">
                <thead class="table-dark">
                    <tr>
                        <th>Name</th>
                        <th>Service</th>
                        <th>Date</th>
                        <th>Status</th>
                        <th>Assigned Mechanic</th>
                        <th>Actions</th>
                    </tr>
                </thead>
                <tbody>
                    {% for booking in bookings %}
                    <tr>
                        <td>{{ booking.name }}</td>
                        <td>{{ booking.get_service_display }}</td>
                        <td>{{ booking.date }}</td>
                        <td>
                            <span class="badge 
                                {% if booking.status == 'approved' %} bg-warning 
                                {% elif booking.status == 'completed' %} bg-success 
                                {% else %} bg-danger {% endif %}">
                                {{ booking.status }}
                            </span>
                        </td>
                        <td>
                            {% if booking.mechanic %}
                                {{ booking.mechanic.get_full_name }}
                            {% else %}
                                <form method="post" action="{% url 'admin_bookings' %}">
                                    {% csrf_token %}
                                    <input type="hidden" name="booking_id" value="{{ booking.id }}">
                                    
                                    <select name="mechanic_id" class="form-select form-select-sm" required>
                                        <option value="" disabled selected>Assign Mechanic</option>
                                        {% for mechanic in mechanics %}
                                            <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
                                        {% endfor %}
                                    </select>

                                    <button type="submit" class="btn btn-primary btn-sm mt-2">Assign</button>
                                </form>
                            {% endif %}
                        </td>
                        <td>
                            <a href="{% url 'approve_booking' booking.id %}" class="btn btn-success btn-sm">Approve</a>
                            <a href="{% url 'cancel_booking' booking.id %}" class="btn btn-danger btn-sm">Cancel</a>
                        </td>
                    </tr>
                    {% empty %}
                    <tr>
                        <td colspan="6" class="text-center">No bookings found.</td>
                    </tr>
                    {% endfor %}
                </tbody>
            </table>
        </div>
    </div>
</div>
{% endblock %}

🔹 Fixes & Improvements

✅ Added action="{% url 'admin_bookings' %}"

Ensures form submits to the correct view.

✅ Added required to <select>

Forces the user to select a mechanic before submitting.

✅ Ensured name="mechanic_id" is correct

The request.POST.get("mechanic_id") should now work properly.

✅ Reformatted class="badge" logic

Improved readability and maintainability.

✅ Next Steps

Restart the Server
Inspect Form using Developer Tools (F12 > Elements Tab)
- Make sure the <select> and <form> fields exist correctly.
Try Assigning a Mechanic

Check Logs

You should now see:

yaml
📩 Form Data: <QueryDict: {'csrfmiddlewaretoken': [...], 'booking_id': ['1'], 'mechanic_id': ['2']}>
🔹 Booking ID: 1, Mechanic ID: 2

Confirm Booking Updated
- Reload the page and confirm the mechanic is assigned.

🚀 Try this out and let me know if it works! 🚀

It looks like the form is submitting correctly, but the mechanic list is empty. This means the mechanics queryset in your view might not be fetching any users. Let's debug and fix it.

✅ Debugging Steps

1. Check If Mechanics Exist in the Database

Run this in Django shell:

python
from django.contrib.auth import get_user_model
CustomUser = get_user_model()

# Check if there are any users in the "Mechanic" group
print(CustomUser.objects.filter(groups__name="Mechanic"))

If the output is empty (<QuerySet []>), then no users are assigned to the "Mechanic" group, which means there's nothing to display.

Fix: Ensure Mechanics Exist

If no users are found, manually add a mechanic:

python
from django.contrib.auth.models import Group, User

mechanic_group, _ = Group.objects.get_or_create(name="Mechanic")

# Create a sample mechanic
mechanic = User.objects.create_user(username="mechanic1", password="test123")
mechanic.groups.add(mechanic_group)
mechanic.save()

print("✅ Mechanic added successfully!")

2. Verify `mechanics` Queryset in Your View

In views.py, add this print statement inside admin_bookings:

python
print("🔎 Mechanics QuerySet:", CustomUser.objects.filter(groups__name="Mechanic"))

Then restart your Django server and reload the page.
Expected Output:

php-template
🔎 Mechanics QuerySet: <QuerySet [<User: mechanic1>]>

If it's still empty, ensure the users are correctly assigned to the "Mechanic" group.

3. Update View to Ensure Mechanics Are Loaded

Modify admin_bookings in views.py:

python
from django.contrib.auth.models import Group

@login_required
def admin_bookings(request):
    CustomUser = get_user_model()  
    mechanics = CustomUser.objects.filter(groups__name="Mechanic")

    print("🔎 Mechanics:", mechanics)  # Debugging Output

    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        print("✅ POST request received!")
        print(f"📩 Form Data: {request.POST}")  

        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}")  

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)

        booking.mechanic = mechanic
        booking.status = 'approved'
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")

        return redirect('admin_bookings')

    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

4. Restart the Server & Test Again

Run the Django shell test (Step 1).
Confirm mechanics exist using print() in views.py.
Reload the booking management page.
If mechanics now appear, assign one and check if it updates.

Expected Outcome

✅ Mechanics should now appear in the dropdown.
✅ After assigning, the mechanic's name should show in the "Assigned Mechanic" column.

Try this and let me know if mechanics appear now! 🚀

Great! That means you do have at least one user (mayor) in the "Mechanic" group. Now, let's verify why the dropdown might still be empty.

🔎 Check If `mechanics` Data Reaches the Template

1️⃣ Modify your admin_bookings view to print mechanics before rendering:

python
print("🔎 Mechanics being passed to template:", list(mechanics))

Restart the Django server and reload the Admin Bookings page.

Expected Output:

pgsql
🔎 Mechanics being passed to template: [<CustomUser: mayor>]

If this prints an empty list, there's still a filtering issue.

🔍 Debugging the Template

Now, add this inside your template (admin_bookings.html) where the dropdown is rendered:

html
{% for mechanic in mechanics %}
    <p>Mechanic: {{ mechanic.get_full_name }}</p>
{% endfor %}

Then reload the page.

Expected Output:
If it prints "Mechanic: Mayor", but the dropdown is still empty, the issue might be:

A JavaScript or frontend issue blocking the dropdown.
The <option> is not rendering correctly.

✅ Ensure the Select Field is Rendering Mechanics

Modify your dropdown to include debugging output:

html
<select name="mechanic_id" class="form-select form-select-sm">
    <option value="" disabled selected>Assign Mechanic</option>
    {% for mechanic in mechanics %}
        <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
    {% empty %}
        <option disabled>No mechanics available</option>
    {% endfor %}
</select>

If you see "No mechanics available", then mechanics is still empty at the template level.

🔹 Next Steps Based on Output

If mechanics appear in the debug print (🔎 Mechanics being passed to template) but not in the dropdown,
- There might be a frontend issue (check JavaScript console for errors).
- The mechanics might be inside {% if %} conditions that prevent them from rendering.
If mechanics is empty in both print and template,
- Double-check that mechanics = CustomUser.objects.filter(groups__name="Mechanic") runs before rendering.

Try these steps and let me know what you find! 🚀

@login_required def admin_bookings(request): CustomUser = get_user_model() # ✅ Ensure CustomUser is available for both GET & POST requests bookings = Booking.objects.all().order_by('-created_at') if request.method == "POST": print("✅ POST request received!") # Debugging Output print(f"📩 Form Data: {request.POST}") # Debugging Output booking_id = request.POST.get('booking_id') mechanic_id = request.POST.get('mechanic_id') print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}") # Debugging Output if not booking_id or not mechanic_id: messages.error(request, "❌ Please select a mechanic!") return redirect('admin_bookings') # Fetch the booking and mechanic booking = get_object_or_404(Booking, id=booking_id) mechanic = get_object_or_404(CustomUser, id=mechanic_id) # Assign mechanic and update status booking.mechanic = mechanic booking.status = 'approved' # Automatically approve when assigning booking.save() messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!") return redirect('admin_bookings') # ✅ Fetch mechanics outside the if block so it's available for GET requests too mechanics = CustomUser.objects.filter(groups__name="Mechanic") return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics}) modift to print("🔎 Mechanics being passed to template:", list(mechanics))

Here’s your modified admin_bookings view with the requested debugging statement:

python
@login_required
def admin_bookings(request):
    CustomUser = get_user_model()  # ✅ Ensure CustomUser is available for both GET & POST requests

    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        print("✅ POST request received!")  # Debugging Output
        print(f"📩 Form Data: {request.POST}")  # Debugging Output

        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}")  # Debugging Output

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        # Fetch the booking and mechanic
        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)

        # Assign mechanic and update status
        booking.mechanic = mechanic
        booking.status = 'approved'  # Automatically approve when assigning
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")

        return redirect('admin_bookings')

    # ✅ Fetch mechanics outside the if block so it's available for GET requests too
    mechanics = CustomUser.objects.filter(groups__name="Mechanic")
    
    # 🔎 Debugging output to check if mechanics are being retrieved
    print("🔎 Mechanics being passed to template:", list(mechanics))

    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

🔍 What to Expect

When you reload the Admin Bookings page, the Django server should print something like:

pgsql
🔎 Mechanics being passed to template: [<CustomUser: mayor>]

or an empty list if no mechanics exist:

pgsql
🔎 Mechanics being passed to template: []

Let me know what you get! 🚀

Nice! That confirms that a mechanic (user mayor) is being retrieved from the database and passed to the template.

However, since you mentioned that "nothing to select from the list", it means the mechanics list is not being displayed properly in the dropdown. Let's debug further:

1️⃣ Check If Mechanics Exist in the Template

Modify your template to print out the mechanics list above the <select> dropdown:

html
<!-- Debugging Output -->
<p>Mechanics Available: 
    {% for mechanic in mechanics %}
        {{ mechanic.get_full_name }} (ID: {{ mechanic.id }}),
    {% empty %}
        No mechanics found!
    {% endfor %}
</p>

After adding this, reload the page and check if the mechanic names are being displayed.

2️⃣ Ensure the `mechanic_id` Values Are Correct

Modify your <select> dropdown inside the table:

html
<select name="mechanic_id" class="form-select form-select-sm">
    <option value="" disabled selected>Assign Mechanic</option>
    {% for mechanic in mechanics %}
        <option value="{{ mechanic.id }}">{{ mechanic.get_full_name }}</option>
    {% endfor %}
</select>

After reloading, inspect the dropdown in your browser (right-click → Inspect Element) to see if it has the expected <option> elements.

3️⃣ Debugging Output in Browser Console

Add this small JavaScript snippet to check if the dropdown is empty:

html
<script>
document.addEventListener("DOMContentLoaded", function() {
    let dropdown = document.querySelector("select[name='mechanic_id']");
    console.log("Mechanic Dropdown Options:", dropdown.innerHTML);
});
</script>

Then open Developer Tools (F12 → Console) and check the output.

🔍 Expected Outcome

If mechanics are printed in the template but not in the dropdown, the issue is with <select>.
If mechanics do not print in the template, something is wrong with passing mechanics to the template.
If the dropdown has no options, inspect the HTML output and check if mechanic.id and mechanic.get_full_name are correct.

Try these steps and let me know what you find! 🚀

Here's your modified HTML with debugging output to help troubleshoot why mechanics might not be appearing in the dropdown:

Changes and Debugging:

Added a Debugging Section:
- Prints all mechanics available in the template.
- If none exist, it explicitly states "No mechanics available!"
Ensures the Mechanics Dropdown is Populated:
- The select element now clearly shows if no mechanics exist.
Verifies Mechanic Data Passed from Backend:
- This will help confirm that mechanics are being correctly retrieved.

Try refreshing the page and checking the mechanics list. If no mechanics appear, check if they are correctly assigned to the "Mechanic" group in the database. 🚀

Mechanics being passed to template: [<CustomUser: mayor>] [31/Mar/2025 10:56:02] "GET /manage/bookings/ HTTP/1.1" 200 4839 [31/Mar/2025 10:56:17] "POST /accounts/logout/ HTTP/1.1" 302 0 [31/Mar/2025 10:56:17] "GET /accounts/login/ HTTP/1.1" 200 2916 [31/Mar/2025 10:56:23] "POST /accounts/login/ HTTP/1.1" 302 0 [31/Mar/2025 10:56:23] "GET /accounts/customer_dashboard/ HTTP/1.1" 200 5232 [31/Mar/2025 10:56:27] "GET /services/ HTTP/1.1" 200 4531 [31/Mar/2025 10:56:31] "GET /booking/ HTTP/1.1" 200 5893 [31/Mar/2025 10:57:12] "POST /booking/ HTTP/1.1" 302 0 [31/Mar/2025 10:57:12] "GET /booking/ HTTP/1.1" 200 5745 🔎 Mechanics being passed to template: [<CustomUser: mayor>] [31/Mar/2025 10:57:23] "GET /manage/bookings/ HTTP/1.1" 200 6596 🔎 Mechanics being passed to template: [<CustomUser: mayor>] [31/Mar/2025 11:06:01] "GET /manage/bookings/ HTTP/1.1" 200 6734 select is empty

Your mechanics query is returning a user (mayor), but the dropdown remains empty. Let's debug further:

Possible Issues & Fixes

✅ 1. Confirm Mechanics are Passed Correctly

Modify your template and add this just before the <select>:

html
<p>🔎 Mechanics Available: 
    {% for mechanic in mechanics %}
        {{ mechanic.get_full_name }} (ID: {{ mechanic.id }}) |  
    {% empty %}
        No mechanics found!
    {% endfor %}
</p>

➡ Reload the page and check if the mechanics are listed.

✅ 2. Ensure `get_full_name` Method Works

Modify the dropdown like this:

html
<option value="{{ mechanic.id }}">{{ mechanic.username }} ({{ mechanic.get_full_name }})</option>

➡ If get_full_name() is None, it will show the username instead.

✅ 3. Confirm Mechanics Belong to the Correct Group

Run this in Django shell (python manage.py shell):

python
from django.contrib.auth import get_user_model
CustomUser = get_user_model()
mechanics = CustomUser.objects.filter(groups__name="Mechanic")

for mechanic in mechanics:
    print(f"✅ Mechanic: {mechanic.username}, ID: {mechanic.id}")

➡ If no output, check if the user mayor is really in the Mechanic group.

✅ 4. Check HTML Output in Browser

Right-click the dropdown in your browser, then click Inspect (Developer Tools) and check if the <option> elements exist inside <select>.

Let me know what the debug outputs show! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from django.contrib.auth import get_user_model >>> CustomUser = get_user_model() >>> mechanics = CustomUser.objects.filter(groups__name="Mechanic") >>> >>> for mechanic in mechanics: ... print(f"✅ Mechanic: {mechanic.username}, ID: {mechanic.id}") ... ✅ Mechanic: mayor, ID: 2 >>>

Great! Your query confirms that you have one mechanic (mayor with ID: 2). Since the dropdown is still empty, let’s check a few more things:

✅ 1. Confirm Mechanics Are Rendered in the Template

Modify your template and add this above the dropdown:

html
<p>🔎 Mechanics Available: 
    {% for mechanic in mechanics %}
        {{ mechanic.username }} (ID: {{ mechanic.id }}) |  
    {% empty %}
        No mechanics found!
    {% endfor %}
</p>

➡ Reload the page and check if it prints "mayor (ID: 2)".

✅ 2. Check the `<select>` Element

Modify your <select> like this to verify the output:

html
<select name="mechanic_id" class="form-select form-select-sm" required>
    <option value="" disabled selected>Assign Mechanic</option>
    {% for mechanic in mechanics %}
        <option value="{{ mechanic.id }}">🔧 {{ mechanic.username }} ({{ mechanic.id }})</option>
    {% empty %}
        <option disabled>No mechanics available</option>
    {% endfor %}
</select>

➡ Right-click the dropdown in your browser, select Inspect, and check if the <option> elements are present.

✅ 3. Debugging Step – Print in View Function

Modify your admin_bookings view:

python
print("🔎 Mechanics being passed to template:", list(mechanics))
for mechanic in mechanics:
    print(f"👨‍🔧 Mechanic: {mechanic.username}, ID: {mechanic.id}")

➡ Run the server, refresh the Admin Bookings page, and check your terminal logs.

Let me know what you see! 🚀

That’s a great way to debug and confirm the available mechanics in your template! ✅

If you want it to be more readable, you can adjust it like this:

html
<p class="mt-3"><strong>Available Mechanics:</strong></p>
<ul>
    {% for mechanic in mechanics %}
        <li>{{ mechanic.get_full_name }} (ID: {{ mechanic.id }})</li>
    {% empty %}
        <li>No mechanics available!</li>
    {% endfor %}
</ul>

This will format the mechanics in a clean list rather than a single line. 🚀

Yes! You can modify it to display the username of each mechanic instead of the ID. Here’s the updated version:

html
<!-- Debugging Output -->
<p class="mt-3"><strong>Available Mechanics:</strong></p>
<ul>
    {% for mechanic in mechanics %}
        <li>{{ mechanic.username }}</li>
    {% empty %}
        <li>No mechanics available!</li>
    {% endfor %}
</ul>

This will now list the usernames of the available mechanics instead of their IDs. 🚀

Here’s a nicely styled version using Bootstrap for a cleaner look:

html
<!-- Debugging Output -->
<div class="card mt-3">
    <div class="card-header bg-primary text-white">
        <h5 class="mb-0">🔧 Available Mechanics</h5>
    </div>
    <div class="card-body">
        {% if mechanics %}
            <ul class="list-group">
                {% for mechanic in mechanics %}
                    <li class="list-group-item">
                        <i class="fas fa-user text-primary"></i> {{ mechanic.username }}
                    </li>
                {% endfor %}
            </ul>
        {% else %}
            <p class="text-muted text-center">No mechanics available!</p>
        {% endif %}
    </div>
</div>

Improvements:

✅ Wrapped in a Bootstrap card for better structure
✅ Used list-group for a modern look
✅ Added an icon for each mechanic for better visual appeal
✅ Centered and styled the "No mechanics available!" message

This should look clean and professional on your admin dashboard. 🚀 Let me know if you want any tweaks!

{% extends 'base.html' %} {% block content %} <h2>Mechanic Dashboard</h2> <p>Welcome, {{ user.username }}! Here are your assigned jobs:</p> {% if assigned_bookings %} <table border="1"> <tr> <th>Customer</th> <th>Service</th> <th>Date</th> <th>Status</th> <th>Actions</th> </tr> {% for booking in assigned_bookings %} <tr> <td>{{ booking.name }}</td> <td>{{ booking.get_service_display }}</td> <td>{{ booking.date }}</td> <td>{{ booking.get_status_display }}</td> <td> <a href="{% url 'update_booking_status' booking.id %}">Update Status</a> </td> </tr> {% endfor %} </table> {% else %} <p>No jobs assigned to you yet.</p> {% endif %} {% endblock %} now lets design this to look nice

Here’s a well-designed version of your Mechanic Dashboard using Bootstrap for a modern and clean look:

html
{% extends 'base.html' %}

{% block content %}
<div class="container mt-4">
    <div class="card shadow-lg">
        <div class="card-header bg-primary text-white">
            <h4 class="mb-0">🔧 Mechanic Dashboard</h4>
        </div>
        <div class="card-body">
            <p class="lead">Welcome, <strong>{{ user.username }}</strong>! Here are your assigned jobs:</p>

            {% if assigned_bookings %}
                <div class="table-responsive">
                    <table class="table table-bordered table-hover">
                        <thead class="table-dark">
                            <tr>
                                <th>Customer</th>
                                <th>Service</th>
                                <th>Date</th>
                                <th>Status</th>
                                <th>Actions</th>
                            </tr>
                        </thead>
                        <tbody>
                            {% for booking in assigned_bookings %}
                                <tr>
                                    <td>{{ booking.name }}</td>
                                    <td>{{ booking.get_service_display }}</td>
                                    <td>{{ booking.date }}</td>
                                    <td>
                                        <span class="badge 
                                            {% if booking.status == 'approved' %} bg-warning 
                                            {% elif booking.status == 'completed' %} bg-success 
                                            {% else %} bg-danger {% endif %}">
                                            {{ booking.get_status_display }}
                                        </span>
                                    </td>
                                    <td>
                                        <a href="{% url 'update_booking_status' booking.id %}" class="btn btn-sm btn-outline-primary">
                                            <i class="fas fa-edit"></i> Update Status
                                        </a>
                                    </td>
                                </tr>
                            {% endfor %}
                        </tbody>
                    </table>
                </div>
            {% else %}
                <div class="alert alert-info text-center">
                    <i class="fas fa-info-circle"></i> No jobs assigned to you yet.
                </div>
            {% endif %}
        </div>
    </div>
</div>
{% endblock %}

✨ Improvements:

✅ Bootstrap styling for a professional look
✅ Card-based layout for a structured design
✅ Table hover effects & responsive design
✅ Badges for status display (green for completed, yellow for approved, red for pending)
✅ Icons for better UX (edit icon for the update button)

This will make your mechanic dashboard visually appealing and user-friendly. 🚀 Let me know if you need further tweaks!

NoReverseMatch at /update_booking_status/1/ Reverse for 'booking_list' not found. 'booking_list' is not a valid view function or pattern name. Request Method: POST Request URL: http://127.0.0.1:8000/update_booking_status/1/ Django Version: 5.1.7 Exception Type: NoReverseMatch Exception Value: Reverse for 'booking_list' not found. 'booking_list' is not a valid view function or pattern name. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\urls\resolvers.py, line 831, in _reverse_with_prefix Raised during: core.views.update_booking_status Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 08:17:04 +0000

The error NoReverseMatch at /update_booking_status/1/ occurs because Django cannot find a URL pattern named 'booking_list'.

🔍 How to Fix It

Check your urls.py
Ensure that you have defined a path() for 'booking_list' in your urls.py. If not, add it:

python
from django.urls import path
from .views import booking_list  # Ensure the view is imported

urlpatterns = [
    path('bookings/', booking_list, name='booking_list'),
]

Verify the redirect in update_booking_status view
If your view is using redirect('booking_list'), but the actual URL name is different, update it to match the correct URL name.

Example:

python
from django.shortcuts import redirect

def update_booking_status(request, booking_id):
    # Your logic here...
    return redirect('admin_bookings')  # Make sure 'admin_bookings' exists in urls.py

Check your template links
If you have <a href="{% url 'booking_list' %}">, update it to match the correct view name.

Once you've done this, restart your server and test again. 🚀

No, as a mechanic, you should not be redirected back to the admin dashboard after updating a booking status. Instead, you should be redirected to the mechanic dashboard or a page that lists your assigned jobs.

✅ Fix the Redirection

In your update_booking_status view, change this:

python
return redirect('admin_bookings')  # ❌ Wrong for mechanics

To:

python
return redirect('mechanic_dashboard')  # ✅ Redirect to the mechanic's dashboard

Ensure `mechanic_dashboard` is Defined in `urls.py`

In your urls.py, make sure you have:

python
path('mechanic/dashboard/', mechanic_dashboard, name='mechanic_dashboard'),

If mechanic_dashboard is not the right name, replace it with whatever URL name is correct for mechanics.

Now, when a mechanic updates a job, they’ll be redirected to their own dashboard instead of the admin panel. 🚀

No, a mechanic should not be redirected to the admin dashboard after updating a booking status. Instead, they should be redirected to their own mechanic dashboard or a page where they can see their assigned jobs.

✅ Correct Redirection for Mechanics

Modify your update_booking_status view:

python
return redirect('mechanic_dashboard')  # ✅ Redirects to mechanic's dashboard

Ensure the Mechanic Dashboard URL Exists

In urls.py, check that there's a URL pattern like this:

python
path('mechanic/dashboard/', mechanic_dashboard, name='mechanic_dashboard'),

If the correct view name is different, update the redirect accordingly.

Now, after updating a booking, the mechanic will be taken back to their dashboard instead of the admin panel, which makes more sense for their role. 🚗🔧

Here's the booking_list view that will display all bookings for the mechanic:

✅ `views.py`

python
from django.shortcuts import render
from django.contrib.auth.decorators import login_required
from .models import Booking

@login_required
def booking_list(request):
    """Display a list of bookings for the logged-in mechanic."""
    bookings = Booking.objects.filter(mechanic=request.user).order_by('-date')  # Show only assigned jobs
    return render(request, 'core/booking_list.html', {'bookings': bookings})

✅ `urls.py`

Ensure this is registered in urls.py:

python
from django.urls import path
from .views import booking_list

urlpatterns = [
    path('bookings/', booking_list, name='booking_list'),
]

✅ `booking_list.html` (Mechanic's Bookings Page)

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center">📋 My Assigned Bookings</h2>

    {% if bookings %}
    <table class="table table-bordered mt-4">
        <thead class="table-dark">
            <tr>
                <th>Customer</th>
                <th>Service</th>
                <th>Date</th>
                <th>Status</th>
                <th>Actions</th>
            </tr>
        </thead>
        <tbody>
            {% for booking in bookings %}
            <tr>
                <td>{{ booking.name }}</td>
                <td>{{ booking.get_service_display }}</td>
                <td>{{ booking.date }}</td>
                <td>
                    <span class="badge 
                        {% if booking.status == 'approved' %} bg-warning 
                        {% elif booking.status == 'completed' %} bg-success 
                        {% else %} bg-danger {% endif %}">
                        {{ booking.status }}
                    </span>
                </td>
                <td>
                    <a href="{% url 'update_booking_status' booking.id %}" class="btn btn-primary btn-sm">Update Status</a>
                </td>
            </tr>
            {% endfor %}
        </tbody>
    </table>
    {% else %}
    <p class="text-center mt-4">No assigned bookings yet.</p>
    {% endif %}
</div>
{% endblock %}

🚀 What This Does

Filters bookings for the logged-in mechanic 🛠️
Displays assigned bookings in a table 📋
Provides an "Update Status" button ✅

Now, when a mechanic logs in and accesses /bookings/, they will see their assigned jobs instead of the admin dashboard. 🚗🔧

{% extends 'core/base.html' %} {% block content %} <div class="container mt-5"> <h2 class="text-center">📊 Admin Dashboard</h2>  <div class="row text-center mt-4"> <div class="col-md-4"> <div class="card text-white bg-success mb-3"> <div class="card-body"> <h5 class="card-title">Approved Bookings</h5> <h3>{{ approved_count }}</h3> </div> </div> </div> <div class="col-md-4"> <div class="card text-white bg-warning mb-3"> <div class="card-body"> <h5 class="card-title">Pending Bookings</h5> <h3>{{ pending_count }}</h3> </div> </div> </div> <div class="col-md-4"> <div class="card text-white bg-danger mb-3"> <div class="card-body"> <h5 class="card-title">Canceled Bookings</h5> <h3>{{ canceled_count }}</h3> </div> </div> </div> </div>  <div class="card mt-3"> <div class="card-header bg-primary text-white"> <h5 class="mb-0">🔧 Available Mechanics</h5> </div> <div class="card-body"> {% if mechanics %} <ul class="list-group"> {% for mechanic in mechanics %} <li class="list-group-item"> <i class="fas fa-user text-primary"></i> {{ mechanic.username }} </li> {% endfor %} </ul> {% else %} <p class="text-muted text-center">No mechanics available!</p> {% endif %} </div> </div>  <div class="card mt-4"> <div class="card-header bg-dark text-white text-center"> <h5>Booking Management</h5> </div> <div class="card-body"> <table class="table table-bordered table-hover"> <thead class="table-dark"> <tr> <th>Name</th> <th>Service</th> <th>Date</th> <th>Status</th> <th>Assigned Mechanic</th> <th>Actions</th> </tr> </thead> <tbody> {% for booking in bookings %} <tr> <td>{{ booking.name }}</td> <td>{{ booking.get_service_display }}</td> <td>{{ booking.date }}</td> <td> <span class="badge {% if booking.status == 'approved' %} bg-warning {% elif booking.status == 'completed' %} bg-success {% else %} bg-danger {% endif %}"> {{ booking.status }} </span> </td> <td> {% if booking.mechanic %} {{ booking.mechanic.get_full_name }} {% else %} <form method="post" action="{% url 'admin_bookings' %}"> {% csrf_token %} <input type="hidden" name="booking_id" value="{{ booking.id }}"> <select name="mechanic_id" class="form-select form-select-sm" required> <option value="" disabled selected>Assign Mechanic</option> {% for mechanic in mechanics %} <option value="{{ mechanic.id }}">{{ mechanic.username }}({{ mechanic.get_full_name }})</option> {% empty %} <option disabled>No mechanics available</option> {% endfor %} </select> <button type="submit" class="btn btn-primary btn-sm mt-2">Assign</button> </form> {% endif %} </td> <td> <a href="{% url 'approve_booking' booking.id %}" class="btn btn-success btn-sm">Approve</a> <a href="{% url 'cancel_booking' booking.id %}" class="btn btn-danger btn-sm">Cancel</a> </td> </tr> {% empty %} <tr> <td colspan="6" class="text-center">No bookings found.</td> </tr> {% endfor %} </tbody> </table> </div> </div> </div> {% endblock %} can i have the totals of approved booking pending booking cancelled booking and also the total users

You need to update your view function to pass these counts to the template. Here’s how you can modify your Django view to include the total counts of:

✅ Approved bookings
⏳ Pending bookings
❌ Canceled bookings
👥 Total users

✅ Modify Your View in `views.py`

python
from django.shortcuts import render
from django.contrib.auth.decorators import login_required
from django.contrib.auth import get_user_model
from .models import Booking

User = get_user_model()  # Get the User model

@login_required
def admin_dashboard(request):
    # Count bookings by status
    approved_count = Booking.objects.filter(status='approved').count()
    pending_count = Booking.objects.filter(status='pending').count()
    canceled_count = Booking.objects.filter(status='canceled').count()

    # Total registered users
    total_users = User.objects.count()

    # Fetch all bookings and mechanics
    bookings = Booking.objects.all().order_by('-date')
    mechanics = User.objects.filter(groups__name="Mechanic")  # Get all users in "Mechanic" group

    context = {
        'approved_count': approved_count,
        'pending_count': pending_count,
        'canceled_count': canceled_count,
        'total_users': total_users,
        'bookings': bookings,
        'mechanics': mechanics,
    }
    return render(request, 'core/admin_dashboard.html', context)

✅ Update Your Template (`admin_dashboard.html`)

Add a new card for Total Users

html
<!-- Overview Cards -->
<div class="row text-center mt-4">
    <div class="col-md-3">
        <div class="card text-white bg-success mb-3">
            <div class="card-body">
                <h5 class="card-title">Approved Bookings</h5>
                <h3>{{ approved_count }}</h3>
            </div>
        </div>
    </div>
    <div class="col-md-3">
        <div class="card text-white bg-warning mb-3">
            <div class="card-body">
                <h5 class="card-title">Pending Bookings</h5>
                <h3>{{ pending_count }}</h3>
            </div>
        </div>
    </div>
    <div class="col-md-3">
        <div class="card text-white bg-danger mb-3">
            <div class="card-body">
                <h5 class="card-title">Canceled Bookings</h5>
                <h3>{{ canceled_count }}</h3>
            </div>
        </div>
    </div>
    <div class="col-md-3">
        <div class="card text-white bg-primary mb-3">
            <div class="card-body">
                <h5 class="card-title">Total Users</h5>
                <h3>{{ total_users }}</h3>
            </div>
        </div>
    </div>
</div>

🚀 What This Update Does

✅ Adds a "Total Users" section to track registered users
✅ Ensures approved, pending, and canceled bookings are counted correctly
✅ Uses Django ORM to efficiently fetch required data

Now, your Admin Dashboard will show a real-time overview of bookings and user statistics! 🚀

@login_required def admin_bookings(request): CustomUser = get_user_model() # ✅ Ensure CustomUser is available for both GET & POST requests bookings = Booking.objects.all().order_by('-created_at') if request.method == "POST": print("✅ POST request received!") # Debugging Output print(f"📩 Form Data: {request.POST}") # Debugging Output booking_id = request.POST.get('booking_id') mechanic_id = request.POST.get('mechanic_id') print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}") # Debugging Output if not booking_id or not mechanic_id: messages.error(request, "❌ Please select a mechanic!") return redirect('admin_bookings') # Fetch the booking and mechanic booking = get_object_or_404(Booking, id=booking_id) mechanic = get_object_or_404(CustomUser, id=mechanic_id) # Assign mechanic and update status booking.mechanic = mechanic booking.status = 'approved' # Automatically approve when assigning booking.save() messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!") return redirect('admin_bookings') # ✅ Fetch mechanics outside the if block so it's available for GET requests too mechanics = CustomUser.objects.filter(groups__name="Mechanic") # 🔎 Debugging output to check if mechanics are being retrieved print("🔎 Mechanics being passed to template:", list(mechanics)) return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics}) merge remove the debugs because its working well now

Here’s your cleaned-up admin_bookings view without the debugging print statements:

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.contrib.auth import get_user_model
from django.contrib import messages
from .models import Booking

@login_required
def admin_bookings(request):
    CustomUser = get_user_model()
    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)

        booking.mechanic = mechanic
        booking.status = 'approved'
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")
        return redirect('admin_bookings')

    mechanics = CustomUser.objects.filter(groups__name="Mechanic")

    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

✅ Removed Debugging Statements
✅ Retained Functionality
✅ Ensured Code Readability

This version keeps everything working smoothly without unnecessary print outputs. 🚀

now merge with from django.shortcuts import render from django.contrib.auth.decorators import login_required from django.contrib.auth import get_user_model from .models import Booking User = get_user_model() # Get the User model @login_required def admin_dashboard(request): # Count bookings by status approved_count = Booking.objects.filter(status='approved').count() pending_count = Booking.objects.filter(status='pending').count() canceled_count = Booking.objects.filter(status='canceled').count() # Total registered users total_users = User.objects.count() # Fetch all bookings and mechanics bookings = Booking.objects.all().order_by('-date') mechanics = User.objects.filter(groups__name="Mechanic") # Get all users in "Mechanic" group context = { 'approved_count': approved_count, 'pending_count': pending_count, 'canceled_count': canceled_count, 'total_users': total_users, 'bookings': bookings, 'mechanics': mechanics, } return render(request, 'core/admin_dashboard.html', context)

Here's the merged version of admin_bookings and admin_dashboard, ensuring all required functionalities are combined into a single, well-structured file:

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.contrib.auth import get_user_model
from django.contrib import messages
from .models import Booking

User = get_user_model()  # Get the User model

@login_required
def admin_dashboard(request):
    # Count bookings by status
    approved_count = Booking.objects.filter(status='approved').count()
    pending_count = Booking.objects.filter(status='pending').count()
    canceled_count = Booking.objects.filter(status='canceled').count()

    # Total registered users
    total_users = User.objects.count()

    # Fetch all bookings and mechanics
    bookings = Booking.objects.all().order_by('-date')
    mechanics = User.objects.filter(groups__name="Mechanic")

    context = {
        'approved_count': approved_count,
        'pending_count': pending_count,
        'canceled_count': canceled_count,
        'total_users': total_users,
        'bookings': bookings,
        'mechanics': mechanics,
    }
    return render(request, 'core/admin_dashboard.html', context)

@login_required
def admin_bookings(request):
    bookings = Booking.objects.all().order_by('-created_at')

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(User, id=mechanic_id)

        booking.mechanic = mechanic
        booking.status = 'approved'
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")
        return redirect('admin_bookings')

    mechanics = User.objects.filter(groups__name="Mechanic")

    return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

🔹 What's Included in This Merge?

✅ Admin Dashboard (admin_dashboard)

Displays total approved, pending, and canceled bookings.
Shows total registered users.
Lists all bookings and mechanics.

✅ Booking Management (admin_bookings)

Allows assigning mechanics to bookings.
Updates booking status to "approved" upon assignment.
Uses messages for user feedback.
Fetches all mechanics in the "Mechanic" group.

This ensures that both functionalities work together seamlessly while maintaining clean and readable code! 🚀

Got it! Since everything is handled within admin_bookings, I'll merge the functionality of admin_dashboard into admin_bookings, ensuring that it displays:

✅ Total Approved, Pending, and Canceled Bookings
✅ Total Users
✅ List of Bookings
✅ Mechanic Assignment Feature

Here's the updated admin_bookings view:

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.contrib.auth import get_user_model
from django.contrib import messages
from .models import Booking

User = get_user_model()  # Get the Custom User model

@login_required
def admin_bookings(request):
    # Count bookings by status
    approved_count = Booking.objects.filter(status='approved').count()
    pending_count = Booking.objects.filter(status='pending').count()
    canceled_count = Booking.objects.filter(status='canceled').count()

    # Total registered users
    total_users = User.objects.count()

    # Fetch all bookings and mechanics
    bookings = Booking.objects.all().order_by('-created_at')
    mechanics = User.objects.filter(groups__name="Mechanic")

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(User, id=mechanic_id)

        booking.mechanic = mechanic
        booking.status = 'approved'
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")
        return redirect('admin_bookings')

    context = {
        'approved_count': approved_count,
        'pending_count': pending_count,
        'canceled_count': canceled_count,
        'total_users': total_users,
        'bookings': bookings,
        'mechanics': mechanics,
    }

    return render(request, 'core/admin_bookings.html', context)

🔹 What’s Updated?

✅ Merged admin_dashboard functionality into admin_bookings.
✅ Now displays total bookings (approved, pending, canceled) and total users.
✅ Keeps the mechanic assignment feature intact.
✅ Uses context to pass all necessary data to admin_bookings.html.

This keeps everything centralized while making the admin dashboard more functional 🚀.

the above is incorrect especially in user i used customuser @login_required def admin_bookings(request): CustomUser = get_user_model() # ✅ Ensure CustomUser is available for both GET & POST requests bookings = Booking.objects.all().order_by('-created_at') if request.method == "POST": print("✅ POST request received!") # Debugging Output print(f"📩 Form Data: {request.POST}") # Debugging Output booking_id = request.POST.get('booking_id') mechanic_id = request.POST.get('mechanic_id') print(f"🔹 Booking ID: {booking_id}, Mechanic ID: {mechanic_id}") # Debugging Output if not booking_id or not mechanic_id: messages.error(request, "❌ Please select a mechanic!") return redirect('admin_bookings') # Fetch the booking and mechanic booking = get_object_or_404(Booking, id=booking_id) mechanic = get_object_or_404(CustomUser, id=mechanic_id) # Assign mechanic and update status booking.mechanic = mechanic booking.status = 'approved' # Automatically approve when assigning booking.save() messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!") return redirect('admin_bookings') # ✅ Fetch mechanics outside the if block so it's available for GET requests too mechanics = CustomUser.objects.filter(groups__name="Mechanic") # 🔎 Debugging output to check if mechanics are being retrieved print("🔎 Mechanics being passed to template:", list(mechanics)) return render(request, 'core/admin_bookings.html', {'bookings': bookings, 'mechanics': mechanics})

Thanks for the clarification! I'll correctly merge the additional features (totals for approved, pending, and canceled bookings, plus total users) while keeping CustomUser intact. Here's the improved version:

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.contrib.auth import get_user_model
from django.contrib import messages
from .models import Booking

CustomUser = get_user_model()  # Get the Custom User model

@login_required
def admin_bookings(request):
    # Count bookings by status
    approved_count = Booking.objects.filter(status='approved').count()
    pending_count = Booking.objects.filter(status='pending').count()
    canceled_count = Booking.objects.filter(status='canceled').count()

    # Total registered users
    total_users = CustomUser.objects.count()

    # Fetch all bookings and mechanics
    bookings = Booking.objects.all().order_by('-created_at')
    mechanics = CustomUser.objects.filter(groups__name="Mechanic")

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)

        booking.mechanic = mechanic
        booking.status = 'approved'  # Automatically approve when assigning
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")
        return redirect('admin_bookings')

    context = {
        'approved_count': approved_count,
        'pending_count': pending_count,
        'canceled_count': canceled_count,
        'total_users': total_users,
        'bookings': bookings,
        'mechanics': mechanics,
    }

    return render(request, 'core/admin_bookings.html', context)

🔹 What’s Updated?

✅ Correctly uses CustomUser instead of User.
✅ Displays totals for approved, pending, and canceled bookings.
✅ Includes total user count in the admin dashboard.
✅ Maintains the mechanic assignment functionality.

This keeps everything streamlined and fully integrated for your admin bookings page 🚀.

Your template is mostly well-structured and already integrates the updates for approved, pending, and canceled bookings. However, I see a couple of small improvements you can make:

✅ Recommended Updates:

Total Users Card:
Since we added total_users in the context, we should display it in the dashboard.
Improve Status Badge Colors:
The color for approved should be green, and completed should have a distinct color like blue to avoid confusion.
Fixing Assigned Mechanic Display:
If booking.mechanic is set, but get_full_name() is missing, it might throw an error. Adding a fallback is safer.
Improve Form Submission UX:
Disable the submit button if no mechanic is selected.

🔹 Updated Code:

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center">📊 Admin Dashboard</h2>

    <!-- Overview Cards -->
    <div class="row text-center mt-4">
        <div class="col-md-3">
            <div class="card text-white bg-info mb-3">
                <div class="card-body">
                    <h5 class="card-title">Total Users</h5>
                    <h3>{{ total_users }}</h3>
                </div>
            </div>
        </div>
        <div class="col-md-3">
            <div class="card text-white bg-success mb-3">
                <div class="card-body">
                    <h5 class="card-title">Approved Bookings</h5>
                    <h3>{{ approved_count }}</h3>
                </div>
            </div>
        </div>
        <div class="col-md-3">
            <div class="card text-white bg-warning mb-3">
                <div class="card-body">
                    <h5 class="card-title">Pending Bookings</h5>
                    <h3>{{ pending_count }}</h3>
                </div>
            </div>
        </div>
        <div class="col-md-3">
            <div class="card text-white bg-danger mb-3">
                <div class="card-body">
                    <h5 class="card-title">Canceled Bookings</h5>
                    <h3>{{ canceled_count }}</h3>
                </div>
            </div>
        </div>
    </div>

    <!-- Available Mechanics -->
    <div class="card mt-3">
        <div class="card-header bg-primary text-white">
            <h5 class="mb-0">🔧 Available Mechanics</h5>
        </div>
        <div class="card-body">
            {% if mechanics %}
                <ul class="list-group">
                    {% for mechanic in mechanics %}
                        <li class="list-group-item">
                            <i class="fas fa-user text-primary"></i> {{ mechanic.username }}
                        </li>
                    {% endfor %}
                </ul>
            {% else %}
                <p class="text-muted text-center">No mechanics available!</p>
            {% endif %}
        </div>
    </div>

    <!-- Booking Management Table -->
    <div class="card mt-4">
        <div class="card-header bg-dark text-white text-center">
            <h5>Booking Management</h5>
        </div>
        <div class="card-body">
            <table class="table table-bordered table-hover">
                <thead class="table-dark">
                    <tr>
                        <th>Name</th>
                        <th>Service</th>
                        <th>Date</th>
                        <th>Status</th>
                        <th>Assigned Mechanic</th>
                        <th>Actions</th>
                    </tr>
                </thead>
                <tbody>
                    {% for booking in bookings %}
                    <tr>
                        <td>{{ booking.name }}</td>
                        <td>{{ booking.get_service_display }}</td>
                        <td>{{ booking.date }}</td>
                        <td>
                            <span class="badge 
                                {% if booking.status == 'approved' %} bg-success 
                                {% elif booking.status == 'completed' %} bg-primary 
                                {% else %} bg-danger {% endif %}">
                                {{ booking.status }}
                            </span>
                        </td>
                        <td>
                            {% if booking.mechanic %}
                                {{ booking.mechanic.get_full_name|default:booking.mechanic.username }}
                            {% else %}
                                <form method="post" action="{% url 'admin_bookings' %}">
                                    {% csrf_token %}
                                    <input type="hidden" name="booking_id" value="{{ booking.id }}">

                                    <select name="mechanic_id" class="form-select form-select-sm mechanic-select" required>
                                        <option value="" disabled selected>Assign Mechanic</option>
                                        {% for mechanic in mechanics %}
                                            <option value="{{ mechanic.id }}">{{ mechanic.username }} ({{ mechanic.get_full_name }})</option>
                                        {% empty %}
                                            <option disabled>No mechanics available</option>
                                        {% endfor %}
                                    </select>

                                    <button type="submit" class="btn btn-primary btn-sm mt-2 assign-btn" disabled>Assign</button>
                                </form>
                            {% endif %}
                        </td>
                        <td>
                            <a href="{% url 'approve_booking' booking.id %}" class="btn btn-success btn-sm">Approve</a>
                            <a href="{% url 'cancel_booking' booking.id %}" class="btn btn-danger btn-sm">Cancel</a>
                        </td>
                    </tr>
                    {% empty %}
                    <tr>
                        <td colspan="6" class="text-center">No bookings found.</td>
                    </tr>
                    {% endfor %}
                </tbody>
            </table>
        </div>
    </div>
</div>

<!-- JavaScript to Enable Button When Mechanic is Selected -->
<script>
    document.addEventListener("DOMContentLoaded", function () {
        document.querySelectorAll(".mechanic-select").forEach(function (select) {
            select.addEventListener("change", function () {
                this.closest("form").querySelector(".assign-btn").disabled = !this.value;
            });
        });
    });
</script>

{% endblock %}

🔹 What's Improved?

✅ Added Total Users Card
- Display the total number of registered users.
✅ Fixed Status Colors:
- approved → green (bg-success)
- completed → blue (bg-primary)
- canceled → red (bg-danger)
✅ Fallback for Mechanic Name Display:
- If get_full_name() is empty, it defaults to mechanic.username.
✅ Improved Assign Mechanic Form:
- The "Assign" button is disabled by default and only activates when a mechanic is selected.

🔥 Final Result

A more complete dashboard with user stats.
Cleaner booking status colors that are visually intuitive.
Better UX when assigning mechanics.

Let me know if you need more refinements! 🚀

{% extends 'core/base.html' %} {% block content %} <div class="container mt-5"> <h2 class="text-center">📊 Admin Dashboard</h2>  <div class="row text-center mt-4"> <div class="col-md-3"> <div class="card text-white bg-info mb-3"> <div class="card-body"> <h5 class="card-title">Total Users</h5> <h3>{{ total_users }}</h3> </div> </div> </div> <div class="col-md-3"> <div class="card text-white bg-success mb-3"> <div class="card-body"> <h5 class="card-title">Approved Bookings</h5> <h3>{{ approved_count }}</h3> </div> </div> </div> <div class="col-md-3"> <div class="card text-white bg-warning mb-3"> <div class="card-body"> <h5 class="card-title">Pending Bookings</h5> <h3>{{ pending_count }}</h3> </div> </div> </div> <div class="col-md-3"> <div class="card text-white bg-danger mb-3"> <div class="card-body"> <h5 class="card-title">Canceled Bookings</h5> <h3>{{ canceled_count }}</h3> </div> </div> </div> </div>  <div class="card mt-3"> <div class="card-header bg-primary text-white"> <h5 class="mb-0">🔧 Available Mechanics</h5> </div> <div class="card-body"> {% if mechanics %} <ul class="list-group"> {% for mechanic in mechanics %} <li class="list-group-item"> <i class="fas fa-user text-primary"></i> {{ mechanic.username }} </li> {% endfor %} </ul> {% else %} <p class="text-muted text-center">No mechanics available!</p> {% endif %} </div> </div>  <div class="card mt-4"> <div class="card-header bg-dark text-white text-center"> <h5>Booking Management</h5> </div> <div class="card-body"> <table class="table table-bordered table-hover"> <thead class="table-dark"> <tr> <th>Name</th> <th>Service</th> <th>Date</th> <th>Status</th> <th>Assigned Mechanic</th> <th>Actions</th> </tr> </thead> <tbody> {% for booking in bookings %} <tr> <td>{{ booking.name }}</td> <td>{{ booking.get_service_display }}</td> <td>{{ booking.date }}</td> <td> <span class="badge {% if booking.status == 'approved' %} bg-success {% elif booking.status == 'completed' %} bg-primary {% else %} bg-danger {% endif %}"> {{ booking.status }} </span> </td> <td> {% if booking.mechanic %} {{ booking.mechanic.get_full_name|default:booking.mechanic.username }} {% else %} <form method="post" action="{% url 'admin_bookings' %}"> {% csrf_token %} <input type="hidden" name="booking_id" value="{{ booking.id }}"> <select name="mechanic_id" class="form-select form-select-sm mechanic-select" required> <option value="" disabled selected>Assign Mechanic</option> {% for mechanic in mechanics %} <option value="{{ mechanic.id }}">{{ mechanic.username }} ({{ mechanic.get_full_name }})</option> {% empty %} <option disabled>No mechanics available</option> {% endfor %} </select> <button type="submit" class="btn btn-primary btn-sm mt-2 assign-btn" disabled>Assign</button> </form> {% endif %} </td> <td> <a href="{% url 'approve_booking' booking.id %}" class="btn btn-success btn-sm">Approve</a> <a href="{% url 'cancel_booking' booking.id %}" class="btn btn-danger btn-sm">Cancel</a> </td> </tr> {% empty %} <tr> <td colspan="6" class="text-center">No bookings found.</td> </tr> {% endfor %} </tbody> </table> </div> </div> </div>  <script> document.addEventListener("DOMContentLoaded", function () { document.querySelectorAll(".mechanic-select").forEach(function (select) { select.addEventListener("change", function () { this.closest("form").querySelector(".assign-btn").disabled = !this.value; }); }); }); </script> {% endblock %} check if it well populates only the total users are polated

If only the total users are populating while other values (like approved_count, pending_count, canceled_count, bookings, and mechanics) are empty, the issue is likely in your views.py file. Here’s how to troubleshoot and fix it:

✅ Step 1: Check Your View Function

Go to your views.py file where you render the admin dashboard and ensure you're passing all necessary context data.

🔹 Example Fix for `admin_dashboard` View:

python
from django.shortcuts import render
from django.contrib.auth.models import User
from .models import Booking, Mechanic  # Import your models

def admin_dashboard(request):
    # Fetch total users
    total_users = User.objects.count()

    # Fetch booking status counts
    approved_count = Booking.objects.filter(status='approved').count()
    pending_count = Booking.objects.filter(status='pending').count()
    canceled_count = Booking.objects.filter(status='canceled').count()

    # Fetch available mechanics
    mechanics = Mechanic.objects.all()

    # Fetch all bookings
    bookings = Booking.objects.all()

    context = {
        'total_users': total_users,
        'approved_count': approved_count,
        'pending_count': pending_count,
        'canceled_count': canceled_count,
        'mechanics': mechanics,
        'bookings': bookings,
    }

    return render(request, 'admin_dashboard.html', context)

✅ Step 2: Verify Data in the Django Shell

Run the Django shell to check if data exists in your database:

bash
python manage.py shell

Then, test your queries:

python
from django.contrib.auth.models import User
from app.models import Booking, Mechanic  # Replace 'app' with your actual app name

print("Total Users:", User.objects.count())
print("Approved Bookings:", Booking.objects.filter(status='approved').count())
print("Pending Bookings:", Booking.objects.filter(status='pending').count())
print("Canceled Bookings:", Booking.objects.filter(status='canceled').count())
print("Total Mechanics:", Mechanic.objects.count())

If any of these return 0, it means your database might not have the expected data.

✅ Step 3: Check Your Database

Ensure you have sample bookings in your database.

bash
python manage.py showmigrations

If necessary, create a booking via the Django admin panel or manually in the shell:

python
from app.models import Booking

new_booking = Booking.objects.create(
    name="John Doe",
    service="oil_change",
    date="2025-04-01",
    status="pending"
)
new_booking.save()

Check if mechanics exist:

python
from app.models import Mechanic
print(Mechanic.objects.all())  # Should return a QuerySet

✅ Step 4: Debugging with `print` or `console.log`

In your template (admin_dashboard.html), you can debug by displaying raw data:

html
<pre>
    Total Users: {{ total_users }}
    Approved: {{ approved_count }}
    Pending: {{ pending_count }}
    Canceled: {{ canceled_count }}
    Mechanics: {{ mechanics|length }}
    Bookings: {{ bookings|length }}
</pre>

If approved_count, pending_count, or bookings are empty, the issue is with how you're fetching data.

✅ Final Check

If the database is populated but values are not showing, ensure the view is correctly linked in urls.py:
```
python
path('admin-dashboard/', admin_dashboard, name='admin_dashboard'),
```
Restart your Django server:
```
bash
python manage.py runserver
```

Let me know if you need more help debugging! 🚀

from django.shortcuts import render,redirect,get_object_or_404 from django.contrib import messages from django.contrib.auth.decorators import login_required from django.contrib.auth import get_user_model from django.conf import settings from accounts.models import CustomUser from .forms import * from .models import * # Create your views here. def home(request): # Check if the user is part of the 'Mechanic' group is_mechanic = request.user.groups.filter(name='Mechanic').exists() return render(request, 'core/home.html', {'is_mechanic': is_mechanic}) # CustomUser = get_user_model() # Ensure we use the custom user model CustomUser = get_user_model() # Get the Custom User model @login_required def admin_bookings(request): # Count bookings by status approved_count = Booking.objects.filter(status='approved').count() pending_count = Booking.objects.filter(status='pending').count() canceled_count = Booking.objects.filter(status='canceled').count() # Total registered users total_users = CustomUser.objects.count() # Fetch all bookings and mechanics bookings = Booking.objects.all().order_by('-created_at') mechanics = CustomUser.objects.filter(groups__name="Mechanic") if request.method == "POST": booking_id = request.POST.get('booking_id') mechanic_id = request.POST.get('mechanic_id') if not booking_id or not mechanic_id: messages.error(request, "❌ Please select a mechanic!") return redirect('admin_bookings') booking = get_object_or_404(Booking, id=booking_id) mechanic = get_object_or_404(CustomUser, id=mechanic_id) booking.mechanic = mechanic booking.status = 'approved' # Automatically approve when assigning booking.save() messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!") return redirect('admin_bookings') context = { 'approved_count': approved_count, 'pending_count': pending_count, 'canceled_count': canceled_count, 'total_users': total_users, 'bookings': bookings, 'mechanics': mechanics, } return render(request, 'core/admin_bookings.html', context) here is the view check

Your admin_bookings view looks well-structured, but since only total users are populating and other values are not, let’s debug and verify potential issues.

✅ Key Checks and Fixes

🔹 1. Confirm Data Exists in the Database

Run the Django shell:

bash
python manage.py shell

Then execute:

python
from accounts.models import CustomUser
from core.models import Booking  # Ensure you use the correct app name

print("Total Users:", CustomUser.objects.count())
print("Approved Bookings:", Booking.objects.filter(status='approved').count())
print("Pending Bookings:", Booking.objects.filter(status='pending').count())
print("Canceled Bookings:", Booking.objects.filter(status='canceled').count())
print("Total Mechanics:", CustomUser.objects.filter(groups__name="Mechanic").count())

If any of these return 0, it means your database is empty or filtering incorrectly.

🔹 2. Fix `status` Filtering

Make sure status values are stored in lowercase or match exactly with your filtering:

python
approved_count = Booking.objects.filter(status__iexact='approved').count()
pending_count = Booking.objects.filter(status__iexact='pending').count()
canceled_count = Booking.objects.filter(status__iexact='canceled').count()

This ensures case-insensitive filtering (iexact).

🔹 3. Debug Context Data in Template

Inside admin_bookings.html, add this debug section:

html
<pre>
Total Users: {{ total_users }}
Approved Bookings: {{ approved_count }}
Pending Bookings: {{ pending_count }}
Canceled Bookings: {{ canceled_count }}
Total Mechanics: {{ mechanics|length }}
Total Bookings: {{ bookings|length }}
</pre>

Then reload the page and check what values appear.

🔹 4. Ensure Bookings Exist

If bookings are not showing, check if they exist:

python
bookings = Booking.objects.all()
print("Bookings:", bookings)

If it's empty, create test data:

python
from core.models import Booking

Booking.objects.create(name="John Doe", service="oil_change", date="2025-04-01", status="pending")

🔹 5. Verify Mechanic Group Membership

Your mechanic query:

python
mechanics = CustomUser.objects.filter(groups__name="Mechanic")

Check if the mechanics actually exist:

python
print("Mechanics:", CustomUser.objects.filter(groups__name="Mechanic"))

If it’s empty:

Ensure users are assigned to the 'Mechanic' group in Django Admin (/admin).

Run:

python
from django.contrib.auth.models import Group

if not Group.objects.filter(name="Mechanic").exists():
    Group.objects.create(name="Mechanic")

Assign a user manually:

python
user = CustomUser.objects.get(username="mechanic_username")
mechanic_group = Group.objects.get(name="Mechanic")
user.groups.add(mechanic_group)
user.save()

✅ Final Steps

Apply the fixes above.
Restart Django server:
```
bash
python manage.py runserver
```
Reload your browser and check the debug <pre> values.

Let me know if you need further help! 🚀

Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from accounts.models import CustomUser >>> from core.models import Booking # Ensure you use the correct app name >>> >>> print("Total Users:", CustomUser.objects.count()) Total Users: 3 >>> print("Approved Bookings:", Booking.objects.filter(status='approved').count()) Approved Bookings: 0 >>> print("Pending Bookings:", Booking.objects.filter(status='pending').count()) Pending Bookings: 0 >>> print("Canceled Bookings:", Booking.objects.filter(status='canceled').count()) Canceled Bookings: 0 >>> print("Total Mechanics:", CustomUser.objects.filter(groups__name="Mechanic").count()) Total Mechanics: 1 >>>

Your database shows:
✅ Total Users: 3
✅ Total Mechanics: 1
⚠️ Approved Bookings: 0
⚠️ Pending Bookings: 0
⚠️ Canceled Bookings: 0

This confirms that no bookings exist in the database, which is why the dashboard is not displaying data.

✅ Steps to Fix the Missing Bookings

🔹 1. Check if Bookings Exist

Try fetching all bookings:

python
print(Booking.objects.all())

If this returns <QuerySet []>, it means there are no bookings in your database.

🔹 2. Manually Create a Test Booking

Since there are no bookings, create one manually in the Django shell:

python
from core.models import Booking

test_booking = Booking.objects.create(
    name="John Doe",
    service="oil_change",  # Use an existing service choice
    date="2025-04-01",
    status="pending"
)

print("Test Booking Created:", test_booking)

Now, re-run:

python
print("Pending Bookings:", Booking.objects.filter(status='pending').count())

You should now see Pending Bookings: 1.

🔹 3. Verify Booking Status Choices

If bookings are still not appearing, check if status is stored differently. Run:

python
print(set(Booking.objects.values_list('status', flat=True)))

If it prints something different like {'Pending', 'APPROVED', 'Canceled'}, then update your filtering:

python
pending_count = Booking.objects.filter(status__iexact='pending').count()
approved_count = Booking.objects.filter(status__iexact='approved').count()
canceled_count = Booking.objects.filter(status__iexact='canceled').count()

This ensures case-insensitive filtering.

🔹 4. Restart the Server & Reload

After adding test bookings, restart Django:

bash
python manage.py runserver

Then, reload the admin dashboard and check if bookings now appear.

✅ Next Steps

If bookings appear, create more via your booking form or Django Admin (/admin).

If bookings still don't show, check if Booking is correctly registered in admin.py:

python
from django.contrib import admin
from .models import Booking

admin.site.register(Booking)

If you get errors, share the models.py for Booking so I can debug further.

Let me know how it goes! 🚀

System check identified no issues (0 silenced). March 31, 2025 - 11:36:03 Django version 5.1.7, using settings 'garage.settings' Starting development server at http://127.0.0.1:8000/ Quit the server with CTRL-BREAK. [31/Mar/2025 11:37:11] "GET /manage/bookings/ HTTP/1.1" 200 7867 [31/Mar/2025 11:38:04] "GET /manage/bookings/cancel/3/ HTTP/1.1" 302 0 [31/Mar/2025 11:38:05] "GET /manage/bookings/ HTTP/1.1" 200 7864 [31/Mar/2025 11:38:08] "GET /manage/bookings/ HTTP/1.1" 200 7864 [31/Mar/2025 11:38:09] "GET /manage/bookings/ HTTP/1.1" 200 7864 (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell >> Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from accounts.models import CustomUser >>> from core.models import Booking # Ensure you use the correct app name >>> >>> print("Total Users:", CustomUser.objects.count()) Total Users: 3 >>> print("Approved Bookings:", Booking.objects.filter(status='approved').count()) Approved Bookings: 0 >>> print("Pending Bookings:", Booking.objects.filter(status='pending').count()) Pending Bookings: 0 >>> print("Canceled Bookings:", Booking.objects.filter(status='canceled').count()) Canceled Bookings: 0 >>> print("Total Mechanics:", CustomUser.objects.filter(groups__name="Mechanic").count()) Total Mechanics: 1 >>> Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 File "<console>", line 1 Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 ^ SyntaxError: invalid decimal literal >>> Type "help", "copyright", "credits" or "license" for more information. File "<console>", line 1 Type "help", "copyright", "credits" or "license" for more information. ^^^^^^ SyntaxError: invalid syntax >>> (InteractiveConsole) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'InteractiveConsole' is not defined >>> >>> from accounts.models import CustomUser File "<console>", line 1 >>> from accounts.models import CustomUser ^^ SyntaxError: invalid syntax >>> >>> from core.models import Booking # Ensure you use the correct app name File "<console>", line 1 >>> from core.models import Booking # Ensure you use the correct app name ^^ SyntaxError: invalid syntax >>> >>> File "<console>", line 1 >>> ^^ SyntaxError: invalid syntax >>> >>> print("Total Users:", CustomUser.objects.count()) File "<console>", line 1 >>> print("Total Users:", CustomUser.objects.count()) ^^ SyntaxError: invalid syntax >>> Total Users: 3 File "<console>", line 1 Total Users: 3 ^^^^^ SyntaxError: invalid syntax >>> >>> print("Approved Bookings:", Booking.objects.filter(status='approved').count()) File "<console>", line 1 >>> print("Approved Bookings:", Booking.objects.filter(status='approved').count()) ^^ SyntaxError: invalid syntax >>> Approved Bookings: 0 File "<console>", line 1 Approved Bookings: 0 ^^^^^^^^ SyntaxError: invalid syntax >>> >>> print("Pending Bookings:", Booking.objects.filter(status='pending').count()) File "<console>", line 1 >>> print("Pending Bookings:", Booking.objects.filter(status='pending').count()) ^^ SyntaxError: invalid syntax >>> Pending Bookings: 0 File "<console>", line 1 Pending Bookings: 0 ^^^^^^^^ SyntaxError: invalid syntax >>> >>> print("Canceled Bookings:", Booking.objects.filter(status='canceled').count()) File "<console>", line 1 >>> print("Canceled Bookings:", Booking.objects.filter(status='canceled').count()) ^^ SyntaxError: invalid syntax >>> Canceled Bookings: 0 File "<console>", line 1 Canceled Bookings: 0 ^^^^^^^^ SyntaxError: invalid syntax >>> >>> print("Total Mechanics:", CustomUser.objects.filter(groups__name="Mechanic").count()) File "<console>", line 1 >>> print("Total Mechanics:", CustomUser.objects.filter(groups__name="Mechanic").count()) ^^ SyntaxError: invalid syntax >>> Total Mechanics: 1 File "<console>", line 1 Total Mechanics: 1 ^^^^^^^^^ SyntaxError: invalid syntax >>> >>>

It looks like your database does not contain any bookings, which is why your dashboard is not displaying anything except the total user count.

✅ Fix: Create Test Bookings

You need to create some test bookings manually and check if they appear.

1️⃣ Verify If Bookings Exist

Run this in your Django shell:

python
from core.models import Booking

print(Booking.objects.all())

If it returns:

css
<QuerySet []>

That means no bookings exist in your database.

2️⃣ Create a Test Booking

Run the following code to add a sample booking:

python
from core.models import Booking
from django.utils.timezone import now

Booking.objects.create(
    name="John Doe",
    service="oil_change",  # Ensure this matches an actual choice in your model
    date=now().date(),
    status="pending"
)

Then confirm:

python
print(Booking.objects.all())
print("Pending Bookings:", Booking.objects.filter(status='pending').count())

Now your dashboard should show Pending Bookings: 1.

3️⃣ Check Status Field Values

Run:

python
print(set(Booking.objects.values_list('status', flat=True)))

If it returns something unexpected like {‘Pending’, ‘APPROVED’, ‘Canceled’}, update your queries to be case-insensitive:

python
approved_count = Booking.objects.filter(status__iexact='approved').count()
pending_count = Booking.objects.filter(status__iexact='pending').count()
canceled_count = Booking.objects.filter(status__iexact='canceled').count()

4️⃣ Restart Django Server

After adding test bookings, restart Django:

bash
python manage.py runserver

Then reload the admin dashboard and check if bookings now appear.

🔍 Next Steps

If bookings appear, create more via your booking form or Django Admin (/admin).
If bookings still don’t show, share your models.py for Booking so I can debug further.

Let me know how it goes! 🚀

Your status values have inconsistent capitalization:

'pending' (lowercase)
'Canceled' (capitalized)
'completed' (lowercase)

This mismatch may be why your queries aren't returning results as expected.

✅ Fix 1: Use Case-Insensitive Filtering

Modify your query in admin_bookings view:

python
approved_count = Booking.objects.filter(status__iexact='approved').count()
pending_count = Booking.objects.filter(status__iexact='pending').count()
canceled_count = Booking.objects.filter(status__iexact='canceled').count()

This ensures case insensitivity (__iexact makes it case-insensitive).

✅ Fix 2: Normalize Data in Database

If you'd like to standardize existing records to lowercase for consistency, run this in Django shell:

python
from core.models import Booking

for booking in Booking.objects.all():
    booking.status = booking.status.lower()
    booking.save()

Then verify:

python
print(set(Booking.objects.values_list('status', flat=True)))

It should now return:

bash
{'pending', 'canceled', 'completed'}

✅ Fix 3: Restrict Status Choices in Model

To prevent future inconsistencies, update your Booking model:

python
class Booking(models.Model):
    STATUS_CHOICES = [
        ('pending', 'Pending'),
        ('approved', 'Approved'),
        ('canceled', 'Canceled'),
        ('completed', 'Completed'),
    ]
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='pending')

Then apply migrations:

bash
python manage.py makemigrations
python manage.py migrate

This will enforce consistent values when saving records.

🎯 Next Steps

Apply Fix 1 (Case-Insensitive Filtering)
Run Fix 2 (Normalize Data)
Implement Fix 3 (Restrict Choices)
Restart Django (python manage.py runserver)
Check Dashboard Again

Try these fixes and let me know if it works! 🚀

To ensure that only admins can access the Manage Bookings page, follow these steps:

✅ Step 1: Restrict Access in `admin_bookings` View

Modify your admin_bookings view in views.py to allow only staff users (admins) to access the page:

python
from django.contrib.admin.views.decorators import staff_member_required

@staff_member_required
def admin_bookings(request):
    # Count bookings by status
    approved_count = Booking.objects.filter(status__iexact='approved').count()
    pending_count = Booking.objects.filter(status__iexact='pending').count()
    canceled_count = Booking.objects.filter(status__iexact='canceled').count()

    # Total registered users
    total_users = CustomUser.objects.count()

    # Fetch all bookings and mechanics
    bookings = Booking.objects.all().order_by('-created_at')
    mechanics = CustomUser.objects.filter(groups__name="Mechanic")

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)

        booking.mechanic = mechanic
        booking.status = 'approved'  # Automatically approve when assigning
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")
        return redirect('admin_bookings')

    context = {
        'approved_count': approved_count,
        'pending_count': pending_count,
        'canceled_count': canceled_count,
        'total_users': total_users,
        'bookings': bookings,
        'mechanics': mechanics,
    }

    return render(request, 'core/admin_bookings.html', context)

@staff_member_required: This decorator only allows superusers or staff members to access the page. If a non-admin tries, they get redirected to the login page.

✅ Step 2: Ensure Admin Users Have `is_staff=True`

Ensure that your admin users have staff status. Run this in Django shell:

python
from accounts.models import CustomUser

admin_user = CustomUser.objects.get(username="admin")  # Change "admin" to the actual username
admin_user.is_staff = True
admin_user.save()

✅ Step 3: Add Admin Bookings to Navbar (if applicable)

If your site has a navbar, update base.html (or wherever your menu is) to only show the Manage Bookings page to admins:

html
{% if request.user.is_staff %}
    <li class="nav-item">
        <a class="nav-link" href="{% url 'admin_bookings' %}">📌 Manage Bookings</a>
    </li>
{% endif %}

This ensures only admins see the menu item.

✅ Step 4: Redirect Admins to Manage Bookings After Login

Modify your settings.py:

python
LOGIN_REDIRECT_URL = '/manage/bookings/'  # Redirects to admin bookings after login

Or, in views.py, override the login behavior:

python
from django.shortcuts import redirect

def custom_login_redirect(request):
    if request.user.is_staff:
        return redirect('admin_bookings')
    return redirect('home')  # Non-admin users go to home

🎯 Final Steps

Test with an admin account:
- Login as an admin and visit /manage/bookings/.
- Ensure non-admin users can't access it.
Test with a non-admin user:
- Try accessing /manage/bookings/.
- It should redirect to login or show an error.

Try it out and let me know if you need further adjustments! 🚀

from django.shortcuts import render, redirect from django.contrib.auth.forms import UserCreationForm from .forms import CustomUserCreationForm from django.contrib.auth import authenticate, login def accounts_home(request): return render(request, 'accounts/home.html') # Ensure this template exists def register_view(request): if request.method == 'POST': form = CustomUserCreationForm(request.POST) if form.is_valid(): form.save() return redirect('login') # After successful registration, redirect to login page else: form = CustomUserCreationForm() return render(request, 'accounts/register.html', {'form': form}) def login_view(request): if request.method == 'POST': username = request.POST['username'] password = request.POST['password'] user = authenticate(request, username=username, password=password) if user is not None: login(request, user) # Redirect based on role if user.role == 'mechanic': return redirect('mechanic_dashboard') # Or any mechanic-specific page elif user.role == 'admin': return redirect('admin_dashboard') # Or any admin-specific page else: return redirect('customer_dashboard') # Or any customer-specific page else: # Handle invalid login pass return render(request, 'accounts/login.html') def customer_dashboard(request): return render(request, 'accounts/customer_dashboard.html') i had earlier created the above anyway i can use it in accounts>views.py

Yes! You can modify and improve your accounts/views.py to integrate role-based redirection after login. I'll refine your existing code to ensure proper redirection for admins, mechanics, and customers while handling authentication properly.

✅ Step 1: Update `views.py` for Better Role Management

Modify your accounts/views.py to include better handling of login logic:

python
from django.shortcuts import render, redirect
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth import authenticate, login
from django.contrib.auth.decorators import login_required
from .forms import CustomUserCreationForm
from accounts.models import CustomUser  # Ensure you're using the correct model

def accounts_home(request):
    return render(request, 'accounts/home.html')  # Ensure this template exists

def register_view(request):
    if request.method == 'POST':
        form = CustomUserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('login')  # Redirect to login page after successful registration
    else:
        form = CustomUserCreationForm()

    return render(request, 'accounts/register.html', {'form': form})


def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)

        if user is not None:
            login(request, user)
            
            # Redirect based on role or user type
            if user.is_staff:  # Admin users
                return redirect('admin_bookings')  # Redirect to admin dashboard
            elif user.groups.filter(name='Mechanic').exists():  # Mechanics group
                return redirect('mechanic_dashboard')  # Redirect to mechanic page
            else:  # Default to customer dashboard
                return redirect('customer_dashboard')
        else:
            # Handle invalid login
            return render(request, 'accounts/login.html', {'error': 'Invalid username or password'})

    return render(request, 'accounts/login.html')


@login_required
def customer_dashboard(request):
    return render(request, 'accounts/customer_dashboard.html')

@login_required
def mechanic_dashboard(request):
    return render(request, 'accounts/mechanic_dashboard.html')

@login_required
def admin_dashboard(request):
    return redirect('admin_bookings')  # Redirect admins to manage bookings

✅ Step 2: Update `urls.py`

Ensure your URLs are correctly mapped in accounts/urls.py:

python
from django.urls import path
from .views import *

urlpatterns = [
    path('', accounts_home, name='accounts_home'),
    path('register/', register_view, name='register'),
    path('login/', login_view, name='login'),
    path('customer/', customer_dashboard, name='customer_dashboard'),
    path('mechanic/', mechanic_dashboard, name='mechanic_dashboard'),
    path('admin/', admin_dashboard, name='admin_dashboard'),
]

✅ Step 3: Ensure Correct Model Setup

Your CustomUser model should have a role or group assignment. If you're using Django groups, check your database:

python
from django.contrib.auth.models import Group, User

# Create Mechanic group if it doesn't exist
mechanic_group, created = Group.objects.get_or_create(name="Mechanic")

# Assign a user to Mechanic group
user = User.objects.get(username="mechanic_user")
user.groups.add(mechanic_group)

✅ Step 4: Improve Templates for Role-Based Access

Modify your navbar in base.html so that only admins, mechanics, or customers see the appropriate menu items:

html
{% if request.user.is_authenticated %}
    {% if request.user.is_staff %}
        <li><a href="{% url 'admin_dashboard' %}">Admin Dashboard</a></li>
    {% elif request.user.groups.all.0.name == "Mechanic" %}
        <li><a href="{% url 'mechanic_dashboard' %}">Mechanic Dashboard</a></li>
    {% else %}
        <li><a href="{% url 'customer_dashboard' %}">Customer Dashboard</a></li>
    {% endif %}
    <li><a href="{% url 'logout' %}">Logout</a></li>
{% else %}
    <li><a href="{% url 'login' %}">Login</a></li>
    <li><a href="{% url 'register' %}">Register</a></li>
{% endif %}

✅ Step 5: Test Your Authentication Flow

Register a new user → Check if they land in the correct dashboard.
Log in as an admin (is_staff=True) → Should redirect to Manage Bookings.
Log in as a mechanic (assigned to "Mechanic" group) → Should go to Mechanic Dashboard.
Log in as a normal user → Should go to Customer Dashboard.
Ensure unauthorized users can't access other dashboards.

This setup ensures a proper role-based redirection and secure access control. Let me know if you need any refinements! 🚀

Since you don’t have a dedicated admin dashboard, but you do have admin_bookings.html inside core/templates/core, we can modify the redirection to send admins directly to the "Manage Bookings" page instead of an admin dashboard.

✅ Update `views.py` in `accounts` App

Modify the login_view function to redirect admins to admin_bookings:

python
from django.shortcuts import render, redirect
from django.contrib.auth import authenticate, login
from django.contrib.auth.decorators import login_required
from .forms import CustomUserCreationForm
from accounts.models import CustomUser  # Ensure correct model import

def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)

        if user is not None:
            login(request, user)

            # Redirect based on role
            if user.is_staff:  # Admins
                return redirect('admin_bookings')  # Redirect to bookings page
            elif user.groups.filter(name='Mechanic').exists():  # Mechanics
                return redirect('mechanic_dashboard')  
            else:  # Default for customers
                return redirect('customer_dashboard')

        else:
            return render(request, 'accounts/login.html', {'error': 'Invalid username or password'})

    return render(request, 'accounts/login.html')

✅ Update `urls.py` in `accounts` App

Since admin_bookings is inside the core app, ensure it's correctly mapped in core/urls.py:

python
from django.urls import path
from .views import admin_bookings  # Import the correct view

urlpatterns = [
    path('manage/bookings/', admin_bookings, name='admin_bookings'),
]

✅ Ensure `admin_bookings` View is in `core/views.py`

Since the Manage Bookings page is inside the core app, make sure your core/views.py contains:

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from accounts.models import CustomUser
from .models import Booking

@login_required
def admin_bookings(request):
    if not request.user.is_staff:  # Ensure only admins access this page
        return redirect('customer_dashboard')

    approved_count = Booking.objects.filter(status='approved').count()
    pending_count = Booking.objects.filter(status='pending').count()
    canceled_count = Booking.objects.filter(status='canceled').count()
    total_users = CustomUser.objects.count()

    bookings = Booking.objects.all().order_by('-created_at')
    mechanics = CustomUser.objects.filter(groups__name="Mechanic")

    if request.method == "POST":
        booking_id = request.POST.get('booking_id')
        mechanic_id = request.POST.get('mechanic_id')

        if not booking_id or not mechanic_id:
            messages.error(request, "❌ Please select a mechanic!")
            return redirect('admin_bookings')

        booking = get_object_or_404(Booking, id=booking_id)
        mechanic = get_object_or_404(CustomUser, id=mechanic_id)

        booking.mechanic = mechanic
        booking.status = 'approved'  
        booking.save()

        messages.success(request, f"✅ {mechanic.get_full_name()} assigned to {booking.name}'s booking!")
        return redirect('admin_bookings')

    context = {
        'approved_count': approved_count,
        'pending_count': pending_count,
        'canceled_count': canceled_count,
        'total_users': total_users,
        'bookings': bookings,
        'mechanics': mechanics,
    }

    return render(request, 'core/admin_bookings.html', context)

✅ Check `admin_bookings.html` Path

Make sure your admin_bookings.html is in core/templates/core/:


garage_system/
│── core/
│   ├── templates/
│   │   ├── core/
│   │   │   ├── admin_bookings.html
│   ├── views.py
│   ├── urls.py

✅ Test the Redirection Flow

Log in as admin (is_staff=True) → You should go to Manage Bookings (admin_bookings).
Log in as mechanic (assigned to "Mechanic" group) → Redirects to Mechanic Dashboard.
Log in as customer (default) → Redirects to Customer Dashboard.
If an unauthorized user manually enters /manage/bookings/, they should be redirected to the Customer Dashboard.

This setup ensures admins go directly to the Manage Bookings page (admin_bookings.html). Let me know if you need any refinements! 🚀

from django.shortcuts import render, redirect from django.contrib.auth.forms import UserCreationForm from .forms import CustomUserCreationForm from django.contrib.auth import authenticate, login def accounts_home(request): return render(request, 'accounts/home.html') # Ensure this template exists def register_view(request): if request.method == 'POST': form = CustomUserCreationForm(request.POST) if form.is_valid(): form.save() return redirect('login') # After successful registration, redirect to login page else: form = CustomUserCreationForm() return render(request, 'accounts/register.html', {'form': form}) def login_view(request): if request.method == 'POST': username = request.POST['username'] password = request.POST['password'] user = authenticate(request, username=username, password=password) if user is not None: login(request, user) # Redirect based on role if user.role == 'mechanic': return redirect('mechanic_dashboard') # Or any mechanic-specific page elif user.role == 'admin': return redirect('admin_dashboard') # Or any admin-specific page else: return redirect('customer_dashboard') # Or any customer-specific page else: # Handle invalid login pass return render(request, 'accounts/login.html') def customer_dashboard(request): return render(request, 'accounts/customer_dashboard.html') here is all trhe views in accounts change where necessary only

Here's the updated accounts/views.py with only the necessary changes to ensure admins are redirected to admin_bookings instead of a non-existent admin_dashboard:

✅ Updated `accounts/views.py`

python
from django.shortcuts import render, redirect
from django.contrib.auth.forms import UserCreationForm
from .forms import CustomUserCreationForm
from django.contrib.auth import authenticate, login

def accounts_home(request):
    return render(request, 'accounts/home.html')  # Ensure this template exists

def register_view(request):
    if request.method == 'POST':
        form = CustomUserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('login')  # After successful registration, redirect to login page
    else:
        form = CustomUserCreationForm()

    return render(request, 'accounts/register.html', {'form': form})

def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)

        if user is not None:
            login(request, user)
            # Redirect based on role
            if user.is_staff:  # Admin users
                return redirect('admin_bookings')  # Redirect to Manage Bookings
            elif user.groups.filter(name='Mechanic').exists():  # Mechanic users
                return redirect('mechanic_dashboard')
            else:  # Default for customers
                return redirect('customer_dashboard')
        else:
            return render(request, 'accounts/login.html', {'error': 'Invalid username or password'})

    return render(request, 'accounts/login.html')

def customer_dashboard(request):
    return render(request, 'accounts/customer_dashboard.html')

✅ Summary of Fixes

Replaced elif user.role == 'admin':
- Instead of checking user.role == 'admin', we now check user.is_staff (which is Django's default way of marking an admin user).
- This ensures proper admin detection without relying on a role field.
Redirected Admins to admin_bookings
- Since you don’t have an admin_dashboard, I redirected admins directly to admin_bookings.
Fixed elif user.role == 'mechanic'
- Changed it to elif user.groups.filter(name='Mechanic').exists() to properly check if a user belongs to the "Mechanic" group.

✅ Expected Behavior After Changes

User Type	Redirect After Login
Admin (`is_staff=True`)	`/manage/bookings/` (Admin Bookings)
Mechanic (in "Mechanic" Group)	`/mechanic_dashboard/`
Regular Customer	`/customer_dashboard/`

This ensures admins land directly on Manage Bookings, while mechanics and customers go to their respective dashboards.

Let me know if you need further adjustments! 🚀

Great! To restrict admins from accessing the customer dashboard, update the customer_dashboard view to prevent staff members (is_staff=True) from accessing it.

✅ Updated `customer_dashboard` View

Modify customer_dashboard in accounts/views.py like this:

python
from django.contrib.auth.decorators import login_required
from django.http import HttpResponseForbidden

@login_required
def customer_dashboard(request):
    if request.user.is_staff:  # Prevent admins from accessing
        return HttpResponseForbidden("You are not allowed to access this page.")

    return render(request, 'accounts/customer_dashboard.html')

✅ How This Works

If an admin (is_staff=True) tries to access /customer_dashboard/, they'll get a 403 Forbidden error.
Regular customers can access it normally.

Alternative (Redirect Instead of Error)

If you want to redirect admins instead of blocking them, modify the view like this:

python
@login_required
def customer_dashboard(request):
    if request.user.is_staff:
        return redirect('admin_bookings')  # Redirect admins to the admin page

    return render(request, 'accounts/customer_dashboard.html')

Now, if an admin tries to visit /customer_dashboard/, they'll be redirected to Manage Bookings instead.

✅ Final Behavior

User Type	Can Access `/customer_dashboard/`?	Action Taken
Admin (`is_staff=True`)	❌ No	Redirect to Admin Bookings or show a 403 error
Mechanic	✅ Yes	Allowed
Regular Customer	✅ Yes	Allowed

This should fully restrict the admin from accessing customer pages. 🚀 Let me know if you need further tweaks!

Your logout button looks fine, but make sure it is inside a <form> that submits a POST request to the Django logout view. Otherwise, it won't work correctly.

✅ Correct Logout Button with Form

html
<form action="{% url 'logout' %}" method="post">
    {% csrf_token %}
    <button type="submit" class="nav-link btn btn-link text-white">Logout</button>
</form>

🔹 Why is this necessary?

Django requires logout to be a POST request for security reasons.
{% csrf_token %} prevents CSRF attacks.

Let me know if you need further adjustments! 🚀

It looks like you're getting two different 403 Forbidden errors:

"GET /accounts/customer_dashboard/ - 403"
- This likely happens because of a permission check. Maybe you're restricting access incorrectly?
"POST /accounts/logout/ - CSRF token incorrect"
- This means Django is rejecting your logout request due to a missing or incorrect CSRF token.

✅ Fix 1: Add `csrf_token` in the Logout Form

Make sure your logout button is inside a form with {% csrf_token %}:

html
<form action="{% url 'logout' %}" method="post">
    {% csrf_token %}
    <button type="submit" class="nav-link btn btn-link text-white">Logout</button>
</form>

✅ Fix 2: Ensure Only Customers Access Their Dashboard

Modify customer_dashboard view to prevent admins from accessing it:

python
from django.contrib.auth.decorators import login_required
from django.http import HttpResponseForbidden

@login_required
def customer_dashboard(request):
    if request.user.role != 'customer':  # Ensure only customers can access
        return HttpResponseForbidden("You do not have permission to access this page.")
    return render(request, 'accounts/customer_dashboard.html')

✅ Fix 3: If Issue Persists, Clear Cookies

Sometimes, old CSRF tokens cause issues. Try clearing your browser cookies and refreshing.
You can also restart your Django server:
```
sh
python manage.py runserver
```

Try these fixes and let me know if you need further debugging! 🚀

Your logout form in core/base.html looks correct, but since you're getting a CSRF token incorrect error, let's go through some possible fixes.

✅ 1. Make Sure `accounts:logout` is Correct

Check your urls.py inside the accounts app. Ensure you have something like:

python
from django.contrib.auth.views import LogoutView

urlpatterns = [
    path('logout/', LogoutView.as_view(next_page='login'), name='logout'),
]

If it's inside an app namespace (accounts), your urls.py in the main project (garage/urls.py) should include:

python
path('accounts/', include(('accounts.urls', 'accounts'), namespace='accounts')),

✅ 2. Use `{% url 'logout' %}` Instead of `{% url 'accounts:logout' %}`

Since Django's default logout view doesn't require a namespace, try:

html
<form action="{% url 'logout' %}" method="POST" style="display: inline;">
    {% csrf_token %}
    <button type="submit" class="nav-link btn btn-link text-white">Logout</button>
</form>

✅ 3. Allow `GET` Requests for Logout (If Needed)

By default, Django’s LogoutView only accepts POST requests for security reasons.
However, if you want a simple logout link (without a form), modify your urls.py:

python
path('logout/', LogoutView.as_view(), name='logout'),

Then in base.html, change the button to a simple link:

html
<a href="{% url 'logout' %}" class="nav-link text-white">Logout</a>

✅ 4. Check CSRF Middleware and Debugging

If you still get the CSRF token incorrect error, check if CSRF protection is disabled somewhere.

Open settings.py and make sure MIDDLEWARE includes:

python
'django.middleware.csrf.CsrfViewMiddleware',

You can also print the CSRF token in the template to debug:

html
<p>CSRF Token: {{ csrf_token }}</p>

Clear browser cookies and restart the Django server:

sh
python manage.py runserver

Try these steps and let me know if the issue persists! 🚀

lets work on the billing well <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } form { display: flex; flex-direction: column; gap: 15px; } label { font-size: 16px; color: #333; } select, input[type="number"], button { padding: 10px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; transition: background-color 0.3s ease; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <label for="service">Select Service:</label> <select name="service"> <option value="" selected>Select a Service (Optional)</option> {% for service in services %} <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option> {% endfor %} </select> {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part"> <option value="" selected>Select a Part (Optional)</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> {% endif %} <button type="submit">Calculate Total</button> </form> </div> </body> </html> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Create Customer</title> <style> body { font-family: Arial, sans-serif; background-color: #f7f7f7; margin: 0; padding: 0; } .container { width: 50%; margin: 40px auto; background-color: #fff; padding: 30px; box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } form { display: flex; flex-direction: column; gap: 20px; } label { font-size: 16px; color: #333; } input[type="text"], input[type="email"], input[type="number"], button { padding: 12px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } input[type="text"], input[type="email"], input[type="number"] { width: 100%; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; padding: 12px; font-size: 16px; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } .form-group { display: flex; flex-direction: column; } </style> </head> <body> <div class="container"> <h1>Create Customer</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <button type="submit">Save Customer</button> </form> </div> </body> </html> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Add Vehicle</title> <style> body { font-family: Arial, sans-serif; background-color: #f7f7f7; margin: 0; padding: 0; } .container { width: 50%; margin: 40px auto; background-color: #fff; padding: 30px; box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; font-size: 24px; } form { display: flex; flex-direction: column; gap: 20px; } label { font-size: 16px; color: #333; } input[type="text"], input[type="email"], input[type="number"], button, select { padding: 12px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } input[type="text"], input[type="email"], input[type="number"], select { width: 100%; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; padding: 12px; font-size: 16px; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } .form-group { display: flex; flex-direction: column; } </style> </head> <body> <div class="container"> <h1>Add Vehicle for {{ customer.name }}</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <button type="submit">Add Vehicle</button> </form> </div> </body> </html> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Invoice - {{ customer.name }}</title> <style> body { font-family: Arial, sans-serif; margin: 0; padding: 0; color: #333; } .invoice-container { width: 80%; margin: 40px auto; padding: 20px; background-color: #fff; box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } .invoice-details { margin-top: 30px; } .invoice-details table { width: 100%; border-collapse: collapse; margin-bottom: 20px; } .invoice-details th, .invoice-details td { padding: 10px; text-align: left; border-bottom: 1px solid #ddd; } .total { font-size: 18px; font-weight: bold; text-align: right; } .footer { text-align: center; margin-top: 40px; font-size: 14px; color: #888; } </style> </head> <body> <div class="invoice-container"> <h1>Invoice</h1> <div class="invoice-details"> <h3>Customer Details:</h3> <table> <tr> <th>Name:</th> <td>{{ customer.name }}</td> </tr> <tr> <th>Email:</th> <td>{{ customer.email }}</td> </tr> <tr> <th>Phone:</th> <td>{{ customer.phone }}</td> </tr> </table> </div> <div class="invoice-details"> <h3>Vehicle Details:</h3> <table> <tr> <th>Make:</th> <td>{{ vehicle.make }}</td> </tr> <tr> <th>Model:</th> <td>{{ vehicle.model }}</td> </tr> <tr> <th>Registration Number:</th> <td>{{ vehicle.registration_number }}</td> </tr> </table> </div> <div class="invoice-details"> <h3>Service Details:</h3> <table> <tr> <th>Service Name:</th> <td>{{ service.name }}</td> </tr> <tr> <th>Service Cost:</th> <td>KSH {{ service.cost }}</td> </tr> </table> </div> <div class="invoice-details"> <h3>Part Details:</h3> <table> <tr> <th>Part Name:</th> <td>{{ part.name }}</td> </tr> <tr> <th>Part Cost:</th> <td>KSH {{ part.cost }}</td> </tr> <tr> <th>Part Quantity:</th> <td>{{ billing.part_quantity }}</td> </tr> </table> </div> <div class="total"> <p>Total Cost: KSH {{ billing.total_cost }}</p> </div> <div class="footer"> <p>© 2025 Garage System. All rights reserved.</p> </div> </div> </body> </html> so i want to know if am logged in as a customer why i have to create a customer also the parts and services generation wwhat if a persons vehicle was not there for parts but i have to fill in the parts b4 generating invoice

Issues Identified:

Customers Creating Customers
- If a customer is logged in, they should not have the ability to create another customer. Only admins or garage staff should create customers.
Mandatory Parts for Invoice
- A vehicle should be able to have a service-only invoice without requiring parts.
- If parts are selected, they should be optional.

Solutions and Fixes

✅ 1. Restrict Customer Creation to Admins/Staff

Modify the create_customer_view to allow only admins or staff to create new customers.

python
from django.contrib.auth.decorators import user_passes_test

def is_admin(user):
    return user.is_staff or user.role == 'admin'

@user_passes_test(is_admin)
def create_customer_view(request):
    if request.method == "POST":
        form = CustomerForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect("customer_list")  # Redirect to customer list after creation
    else:
        form = CustomerForm()

    return render(request, "accounts/create_customer.html", {"form": form})

✅ 2. Allow Service-Only Invoices (Make Parts Optional)

Update your invoice generation logic to check if parts exist before including them.

Modify Invoice Template (`invoice.html`)

Add an {% if part %} condition:

html
<div class="invoice-details">
    <h3>Service Details:</h3>
    <table>
        <tr>
            <th>Service Name:</th>
            <td>{{ service.name }}</td>
        </tr>
        <tr>
            <th>Service Cost:</th>
            <td>KSH {{ service.cost }}</td>
        </tr>
    </table>
</div>

{% if part %}
<div class="invoice-details">
    <h3>Part Details:</h3>
    <table>
        <tr>
            <th>Part Name:</th>
            <td>{{ part.name }}</td>
        </tr>
        <tr>
            <th>Part Cost:</th>
            <td>KSH {{ part.cost }}</td>
        </tr>
        <tr>
            <th>Part Quantity:</th>
            <td>{{ billing.part_quantity }}</td>
        </tr>
    </table>
</div>
{% endif %}

Modify Invoice Calculation Logic

Ensure your billing logic in views.py does not require a part.

python
def generate_invoice(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)
    customer = vehicle.customer

    if request.method == "POST":
        service_id = request.POST.get("service")
        part_id = request.POST.get("part")
        
        service = Service.objects.get(id=service_id) if service_id else None
        part = Part.objects.get(id=part_id) if part_id else None

        total_cost = service.cost if service else 0
        if part:
            total_cost += part.cost

        billing = Billing.objects.create(
            customer=customer,
            vehicle=vehicle,
            service=service,
            part=part,
            total_cost=total_cost
        )

        return redirect("invoice_detail", billing.id)

    services = Service.objects.all()
    parts = Part.objects.all()
    return render(request, "billing/generate_invoice.html", {"vehicle": vehicle, "services": services, "parts": parts})

✅ 3. Restrict Access to Certain Pages Based on Role

To prevent customers from accessing admin-only pages like creating a customer, update views.py:

python
from django.contrib.auth.decorators import login_required

@login_required
def create_customer(request):
    if not request.user.is_staff:
        return HttpResponseForbidden("You are not allowed to create customers.")
    
    if request.method == "POST":
        form = CustomerForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect("customer_list")
    else:
        form = CustomerForm()

    return render(request, "accounts/create_customer.html", {"form": form})

✅ 4. Redirect Customers to Their Dashboard on Login

Modify the login logic in views.py:

python
def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)

        if user is not None:
            login(request, user)

            if user.role == 'admin':
                return redirect('admin_dashboard')
            elif user.role == 'mechanic':
                return redirect('mechanic_dashboard')
            else:  # Default to customer
                return redirect('customer_dashboard')
        else:
            # Handle invalid login
            pass

    return render(request, 'accounts/login.html')

Final Outcome:

✔️ Customers cannot create other customers
✔️ Parts are optional when generating an invoice
✔️ Customers cannot access admin functions
✔️ Redirects work correctly based on user roles

Try these updates and let me know if you need any adjustments! 🚀

<div class="invoice-details"> <h3>Service Details:</h3> <table> <tr> <th>Service Name:</th> <td>{{ service.name }}</td> </tr> <tr> <th>Service Cost:</th> <td>KSH {{ service.cost }}</td> </tr> </table> </div> {% if part %} <div class="invoice-details"> <h3>Part Details:</h3> <table> <tr> <th>Part Name:</th> <td>{{ part.name }}</td> </tr> <tr> <th>Part Cost:</th> <td>KSH {{ part.cost }}</td> </tr> <tr> <th>Part Quantity:</th> <td>{{ billing.part_quantity }}</td> </tr> </table> </div> {% endif %} below is the previous invoice.html correct <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Invoice - {{ customer.name }}</title> <style> body { font-family: Arial, sans-serif; margin: 0; padding: 0; color: #333; } .invoice-container { width: 80%; margin: 40px auto; padding: 20px; background-color: #fff; box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } .invoice-details { margin-top: 30px; } .invoice-details table { width: 100%; border-collapse: collapse; margin-bottom: 20px; } .invoice-details th, .invoice-details td { padding: 10px; text-align: left; border-bottom: 1px solid #ddd; } .total { font-size: 18px; font-weight: bold; text-align: right; } .footer { text-align: center; margin-top: 40px; font-size: 14px; color: #888; } </style> </head> <body> <div class="invoice-container"> <h1>Invoice</h1> <div class="invoice-details"> <h3>Customer Details:</h3> <table> <tr> <th>Name:</th> <td>{{ customer.name }}</td> </tr> <tr> <th>Email:</th> <td>{{ customer.email }}</td> </tr> <tr> <th>Phone:</th> <td>{{ customer.phone }}</td> </tr> </table> </div> <div class="invoice-details"> <h3>Vehicle Details:</h3> <table> <tr> <th>Make:</th> <td>{{ vehicle.make }}</td> </tr> <tr> <th>Model:</th> <td>{{ vehicle.model }}</td> </tr> <tr> <th>Registration Number:</th> <td>{{ vehicle.registration_number }}</td> </tr> </table> </div> <div class="invoice-details"> <h3>Service Details:</h3> <table> <tr> <th>Service Name:</th> <td>{{ service.name }}</td> </tr> <tr> <th>Service Cost:</th> <td>KSH {{ service.cost }}</td> </tr> </table> </div> <div class="invoice-details"> <h3>Part Details:</h3> <table> <tr> <th>Part Name:</th> <td>{{ part.name }}</td> </tr> <tr> <th>Part Cost:</th> <td>KSH {{ part.cost }}</td> </tr> <tr> <th>Part Quantity:</th> <td>{{ billing.part_quantity }}</td> </tr> </table> </div> <div class="total"> <p>Total Cost: KSH {{ billing.total_cost }}</p> </div> <div class="footer"> <p>© 2025 Garage System. All rights reserved.</p> </div> </div> </body> </html>

Your correction is right! You correctly wrapped the Part Details section in {% if part %} ... {% endif %} to ensure that it only displays when a part is actually selected.

Fix in the previous invoice template:

In the old version, the part details section was always rendered, even when no part was selected.

Your corrected version:

django
{% if part %}
<div class="invoice-details">
    <h3>Part Details:</h3>
    <table>
        <tr>
            <th>Part Name:</th>
            <td>{{ part.name }}</td>
        </tr>
        <tr>
            <th>Part Cost:</th>
            <td>KSH {{ part.cost }}</td>
        </tr>
        <tr>
            <th>Part Quantity:</th>
            <td>{{ billing.part_quantity }}</td>
        </tr>
    </table>
</div>
{% endif %}

This ensures that the part details only show up if a part is included in the invoice.

Additional Fix:

You might also want to wrap the Service Details section with {% if service %} ... {% endif %} in case a customer does not select a service.

django
{% if service %}
<div class="invoice-details">
    <h3>Service Details:</h3>
    <table>
        <tr>
            <th>Service Name:</th>
            <td>{{ service.name }}</td>
        </tr>
        <tr>
            <th>Service Cost:</th>
            <td>KSH {{ service.cost }}</td>
        </tr>
    </table>
</div>
{% endif %}

Final Fix:

If both service and parts are optional, then neither should be mandatory to generate the invoice.

This ensures: ✅ You can generate an invoice even if only a service is selected.
✅ You can generate an invoice even if only a part is selected.
✅ You can generate an invoice if both are selected.
✅ If neither is selected, only customer and vehicle details will show.

Now, do you want to add logic to prevent forcing customers to create themselves again? If you're logged in as a customer, the system should automatically detect and use your details instead of asking you to input them manually. Let me know, and we can fix that too! 🚀

Here’s the full corrected version of your invoice.html with the necessary fixes:

Wrapped both Service and Part Details in {% if %} conditions to ensure they only appear when data is available.
Ensured the invoice is flexible, allowing for cases where a customer might select only a service, only a part, or both.

Updated `invoice.html`

django
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice - {{ customer.name }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            color: #333;
        }
        .invoice-container {
            width: 80%;
            margin: 40px auto;
            padding: 20px;
            background-color: #fff;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        .invoice-details {
            margin-top: 30px;
        }
        .invoice-details table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 20px;
        }
        .invoice-details th, .invoice-details td {
            padding: 10px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }
        .total {
            font-size: 18px;
            font-weight: bold;
            text-align: right;
        }
        .footer {
            text-align: center;
            margin-top: 40px;
            font-size: 14px;
            color: #888;
        }
    </style>
</head>
<body>

<div class="invoice-container">
    <h1>Invoice</h1>

    <!-- Customer Details -->
    <div class="invoice-details">
        <h3>Customer Details:</h3>
        <table>
            <tr>
                <th>Name:</th>
                <td>{{ customer.name }}</td>
            </tr>
            <tr>
                <th>Email:</th>
                <td>{{ customer.email }}</td>
            </tr>
            <tr>
                <th>Phone:</th>
                <td>{{ customer.phone }}</td>
            </tr>
        </table>
    </div>

    <!-- Vehicle Details -->
    <div class="invoice-details">
        <h3>Vehicle Details:</h3>
        <table>
            <tr>
                <th>Make:</th>
                <td>{{ vehicle.make }}</td>
            </tr>
            <tr>
                <th>Model:</th>
                <td>{{ vehicle.model }}</td>
            </tr>
            <tr>
                <th>Registration Number:</th>
                <td>{{ vehicle.registration_number }}</td>
            </tr>
        </table>
    </div>

    <!-- Service Details (Only shown if a service is selected) -->
    {% if service %}
    <div class="invoice-details">
        <h3>Service Details:</h3>
        <table>
            <tr>
                <th>Service Name:</th>
                <td>{{ service.name }}</td>
            </tr>
            <tr>
                <th>Service Cost:</th>
                <td>KSH {{ service.cost }}</td>
            </tr>
        </table>
    </div>
    {% endif %}

    <!-- Part Details (Only shown if a part is selected) -->
    {% if part %}
    <div class="invoice-details">
        <h3>Part Details:</h3>
        <table>
            <tr>
                <th>Part Name:</th>
                <td>{{ part.name }}</td>
            </tr>
            <tr>
                <th>Part Cost:</th>
                <td>KSH {{ part.cost }}</td>
            </tr>
            <tr>
                <th>Part Quantity:</th>
                <td>{{ billing.part_quantity }}</td>
            </tr>
        </table>
    </div>
    {% endif %}

    <!-- Total Cost -->
    <div class="total">
        <p>Total Cost: KSH {{ billing.total_cost }}</p>
    </div>

    <!-- Footer -->
    <div class="footer">
        <p>&copy; 2025 Garage System. All rights reserved.</p>
    </div>
</div>

</body>
</html>

Summary of Fixes

✅ Service Details are now optional → Shown only when a service is selected.
✅ Part Details are now optional → Shown only when a part is selected.
✅ Total cost remains displayed regardless of the selection.
✅ Invoice remains clean and avoids empty sections when either part or service is missing.

Next Steps

Would you like to add a section for labor costs or additional charges?
Do you need a "Download as PDF" button for invoices? (I can help integrate it using Django xhtml2pdf or wkhtmltopdf.)
Should we make invoices searchable in the system for easy retrieval?

Let me know how you’d like to refine this! 🚀

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Create Customer</title> <style> body { font-family: Arial, sans-serif; background-color: #f7f7f7; margin: 0; padding: 0; } .container { width: 50%; margin: 40px auto; background-color: #fff; padding: 30px; box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } form { display: flex; flex-direction: column; gap: 20px; } label { font-size: 16px; color: #333; } input[type="text"], input[type="email"], input[type="number"], button { padding: 12px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } input[type="text"], input[type="email"], input[type="number"] { width: 100%; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; padding: 12px; font-size: 16px; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } .form-group { display: flex; flex-direction: column; } </style> </head> <body> <div class="container"> <h1>Create Customer</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <button type="submit">Save Customer</button> </form> </div> </body> </html> i want this create customer to display the details fo the loged in customer

To display the details of the logged-in customer on the "Create Customer" page, you need to:

Pre-fill the form fields with the logged-in user's details.
Ensure the form is read-only or editable based on your requirements.
Fetch user details dynamically from the request context in Django.

Steps to Implement

Modify Your Django View (views.py)
- Fetch the logged-in user's details.
- Pre-populate the form if a customer profile exists.
Update Your Template (create_customer.html)
- Use Django’s templating syntax to display the user's name, email, and phone.

Updated `views.py`

python
from django.shortcuts import render, redirect
from .forms import CustomerForm
from .models import Customer

def create_customer(request):
    user = request.user  # Get logged-in user
    customer = None

    # Check if a customer profile exists for the logged-in user
    try:
        customer = Customer.objects.get(user=user)
    except Customer.DoesNotExist:
        customer = None

    # Pre-fill the form with user details if a profile exists
    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            form.instance.user = user  # Ensure user is linked to the customer
            form.save()
            return redirect("customer_dashboard")  # Change this to your success page
    else:
        # If customer exists, pre-fill their details
        initial_data = {
            "name": user.get_full_name() if user.get_full_name() else user.username,
            "email": user.email,
        }
        if customer:
            initial_data["phone"] = customer.phone

        form = CustomerForm(initial=initial_data)

    return render(request, "create_customer.html", {"form": form, "user": user, "customer": customer})

Updated `create_customer.html`

django
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Create Customer</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 50%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        input[type="text"], input[type="email"], input[type="number"], button {
            padding: 12px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        input[type="text"], input[type="email"], input[type="number"] {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            padding: 12px;
            font-size: 16px;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        .user-details {
            background: #f1f1f1;
            padding: 15px;
            border-radius: 5px;
            margin-bottom: 20px;
        }
        .user-details p {
            margin: 5px 0;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Create Customer</h1>

    <!-- Display Logged-in User's Details -->
    <div class="user-details">
        <p><strong>Name:</strong> {{ user.get_full_name|default:user.username }}</p>
        <p><strong>Email:</strong> {{ user.email }}</p>
        {% if customer %}
            <p><strong>Phone:</strong> {{ customer.phone }}</p>
        {% endif %}
    </div>

    <!-- Customer Form -->
    <form method="post">
        {% csrf_token %}
        {{ form.as_p }}
        <button type="submit">Save Customer</button>
    </form>
</div>

</body>
</html>

How This Works

✅ If the user is logged in, their name and email are displayed.
✅ If a customer profile exists, their phone number is also shown.
✅ Pre-filled form ensures existing customer details are loaded.
✅ If no customer exists, the form allows them to create one.

Next Steps

Do you want phone numbers to be editable or locked for changes?
Should customers be restricted to one profile, or can they create multiple?
Would you like auto-redirection if a customer already exists?

Let me know how you'd like to tweak this! 🚀

FieldError at /billing/create_customer/ Cannot resolve keyword 'user' into field. Choices are: email, id, name, phone, vehicle Request Method: GET Request URL: http://127.0.0.1:8000/billing/create_customer/ Django Version: 5.1.7 Exception Type: FieldError Exception Value: Cannot resolve keyword 'user' into field. Choices are: email, id, name, phone, vehicle Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\query.py, line 1768, in names_to_path Raised during: billing.views.create_customer Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 09:43:16 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 18, in create_customer customer = Customer.objects.get(user=user) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The error "Cannot resolve keyword 'user' into field" means that your Customer model does not have a user field, but your view is trying to query Customer.objects.get(user=user).

Fix the Issue

You need to check your Customer model and ensure it has a field linking it to the Django User model.

Option 1: If You Want to Link Customers to Users

Modify your Customer model (models.py) to include a foreign key to User:

python
from django.contrib.auth.models import User
from django.db import models

class Customer(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, null=True, blank=True)  # Add this
    name = models.CharField(max_length=100)
    email = models.EmailField(unique=True)
    phone = models.CharField(max_length=15, blank=True, null=True)
    vehicle = models.CharField(max_length=50, blank=True, null=True)  # Assuming vehicle info is stored as a string

    def __str__(self):
        return self.name

Step 1: Run Migrations

Since you've added a new field, run:

bash
python manage.py makemigrations
python manage.py migrate

Step 2: Update `views.py` to Fetch Customers Correctly

Now that your Customer model has a user field, update the query in views.py:

python
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .forms import CustomerForm
from .models import Customer

@login_required  # Ensure only logged-in users can access this view
def create_customer(request):
    user = request.user  # Get the logged-in user
    customer = None

    try:
        customer = Customer.objects.get(user=user)  # Query based on user
    except Customer.DoesNotExist:
        customer = None

    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            customer = form.save(commit=False)
            customer.user = user  # Link the customer to the logged-in user
            customer.save()
            return redirect("customer_dashboard")  # Redirect to a dashboard or another page
    else:
        initial_data = {
            "name": user.get_full_name() if user.get_full_name() else user.username,
            "email": user.email,
        }
        if customer:
            initial_data["phone"] = customer.phone

        form = CustomerForm(initial=initial_data)

    return render(request, "create_customer.html", {"form": form, "customer": customer})

Step 3: Update `admin.py` (Optional)

If you want to see the customers in the Django admin panel:

python
from django.contrib import admin
from .models import Customer

@admin.register(Customer)
class CustomerAdmin(admin.ModelAdmin):
    list_display = ("name", "email", "phone", "user")  # Include the user field

Alternative (If Customers Are Not Linked to Users)

If your Customer model is not linked to Django's User model, remove user=user from the query in views.py:

python
customer = Customer.objects.get(email=user.email)  # Query by email instead

Conclusion

✅ If customers should be linked to users → Add a user field and use user=user.
✅ If customers are independent → Use email=user.email or another unique field.

Let me know if you need further clarifications! 🚀

Since you have a CustomUser model in the accounts app, you should update your Customer model and views to reference it correctly.

Step 1: Ensure Your `Customer` Model Uses `CustomUser`

Modify your Customer model (models.py) in the billing app:

python
from django.db import models
from accounts.models import CustomUser  # Import your CustomUser model

class Customer(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True)  # Link to CustomUser
    name = models.CharField(max_length=100)
    email = models.EmailField(unique=True)
    phone = models.CharField(max_length=15, blank=True, null=True)
    vehicle = models.CharField(max_length=50, blank=True, null=True)  # Assuming vehicle info is stored as a string

    def __str__(self):
        return self.name

Step 2: Run Migrations

Since you've modified the model, run:

bash
python manage.py makemigrations billing
python manage.py migrate

Step 3: Update Your `views.py` to Fetch the Logged-in Customer

Modify the create_customer view in billing/views.py:

python
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .forms import CustomerForm
from .models import Customer
from accounts.models import CustomUser  # Import CustomUser

@login_required
def create_customer(request):
    user = request.user  # Get the logged-in user
    customer = None

    try:
        customer = Customer.objects.get(user=user)  # Query based on CustomUser
    except Customer.DoesNotExist:
        customer = None

    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            customer = form.save(commit=False)
            customer.user = user  # Link the customer to the logged-in CustomUser
            customer.save()
            return redirect("customer_dashboard")  # Redirect to a dashboard or another page
    else:
        initial_data = {
            "name": user.get_full_name() if hasattr(user, "get_full_name") else user.username,
            "email": user.email,
        }
        if customer:
            initial_data["phone"] = customer.phone

        form = CustomerForm(initial=initial_data)

    return render(request, "create_customer.html", {"form": form, "customer": customer})

Step 4: Update `forms.py` to Ensure It Works With `CustomUser`

Modify your CustomerForm in billing/forms.py:

python
from django import forms
from .models import Customer

class CustomerForm(forms.ModelForm):
    class Meta:
        model = Customer
        fields = ["name", "email", "phone", "vehicle"]  # Only relevant fields

Step 5: Ensure Your `CustomUser` Model in `accounts/models.py` is Set Up Correctly

If you don’t already have a CustomUser, it should look something like this:

python
from django.contrib.auth.models import AbstractUser
from django.db import models

class CustomUser(AbstractUser):
    phone_number = models.CharField(max_length=15, blank=True, null=True)

    def __str__(self):
        return self.username

Step 6: Ensure Django Uses `CustomUser` as the Default

In settings.py:

python
AUTH_USER_MODEL = "accounts.CustomUser"

Step 7: Make Sure Users Are Created in the Right Way

If you have a CustomUser, when creating users via the Django shell or signup form, ensure you’re creating instances of CustomUser rather than Django's default User.

To create a user:

python
from accounts.models import CustomUser
user = CustomUser.objects.create_user(username="testuser", email="test@example.com", password="password123")

Conclusion

✅ Linked Customers to CustomUser using a OneToOneField
✅ Updated Views to Fetch Customers Based on CustomUser
✅ Ensured Forms and Queries Work Properly

This should fix your "Cannot resolve keyword 'user' into field" issue. Let me know if you need further help! 🚀

also the vehicle we will create later here <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Add Vehicle</title> <style> body { font-family: Arial, sans-serif; background-color: #f7f7f7; margin: 0; padding: 0; } .container { width: 50%; margin: 40px auto; background-color: #fff; padding: 30px; box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; font-size: 24px; } form { display: flex; flex-direction: column; gap: 20px; } label { font-size: 16px; color: #333; } input[type="text"], input[type="email"], input[type="number"], button, select { padding: 12px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } input[type="text"], input[type="email"], input[type="number"], select { width: 100%; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; padding: 12px; font-size: 16px; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } .form-group { display: flex; flex-direction: column; } </style> </head> <body> <div class="container"> <h1>Add Vehicle for {{ customer.name }}</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <button type="submit">Add Vehicle</button> </form> </div> </body> </html>

Got it! You'll be creating a vehicle after registering a customer. Here’s what you need to do:

Step 1: Create a Vehicle Model (`models.py` in `billing` app)

Since a customer can have multiple vehicles, we’ll use a ForeignKey.

python
from django.db import models
from accounts.models import CustomUser  

class Customer(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True)
    name = models.CharField(max_length=100)
    email = models.EmailField(unique=True)
    phone = models.CharField(max_length=15, blank=True, null=True)

    def __str__(self):
        return self.name

class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE, related_name="vehicles")
    make = models.CharField(max_length=100)
    model = models.CharField(max_length=100)
    registration_number = models.CharField(max_length=20, unique=True)

    def __str__(self):
        return f"{self.make} {self.model} - {self.registration_number}"

Step 2: Run Migrations

Since we added the Vehicle model, run:

bash
python manage.py makemigrations billing
python manage.py migrate

Step 3: Create a Form for Vehicle Registration (`forms.py`)

python
from django import forms
from .models import Vehicle

class VehicleForm(forms.ModelForm):
    class Meta:
        model = Vehicle
        fields = ["make", "model", "registration_number"]

Step 4: Create the `add_vehicle` View (`views.py`)

Modify views.py in the billing app:

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from .models import Customer, Vehicle
from .forms import VehicleForm

@login_required
def add_vehicle(request):
    customer = get_object_or_404(Customer, user=request.user)  # Get logged-in user's customer profile

    if request.method == "POST":
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Link the vehicle to the logged-in customer
            vehicle.save()
            return redirect("customer_dashboard")  # Redirect to a dashboard page
    else:
        form = VehicleForm()

    return render(request, "add_vehicle.html", {"form": form, "customer": customer})

Step 5: Add the URL Path (`urls.py` in `billing` app)

Add a URL for adding vehicles:

python
from django.urls import path
from .views import add_vehicle

urlpatterns = [
    path("add_vehicle/", add_vehicle, name="add_vehicle"),
]

Step 6: Update the Add Vehicle Template (`add_vehicle.html`)

Update your template to correctly pass the customer's name:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Add Vehicle</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 50%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
            font-size: 24px;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        input[type="text"], button {
            padding: 12px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            padding: 12px;
            font-size: 16px;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Add Vehicle for {{ customer.name }}</h1>
    <form method="post">
        {% csrf_token %}
        {{ form.as_p }}
        <button type="submit">Add Vehicle</button>
    </form>
</div>

</body>
</html>

Step 7: Add a Button to Go to "Add Vehicle" Page

Modify your customer dashboard template (customer_dashboard.html or wherever you want to place the button):

html
<a href="{% url 'add_vehicle' %}">
    <button>Add Vehicle</button>
</a>

Final Workflow

✅ Customer is created first
✅ After customer registration, user can add a vehicle
✅ Vehicle is linked to the logged-in customer

Now, when a customer logs in, they can add vehicles to their profile. Let me know if you need any modifications! 🚀

Got it! Let's fix the create_customer view so that it properly associates the logged-in user with their customer details.

Step 1: Fix the Error in `views.py`

The issue happens because your Customer model does not have a user field linked to CustomUser. Let's update the view to use the correct field.

Modify `create_customer` View

python
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .models import Customer
from .forms import CustomerForm

@login_required
def create_customer(request):
    user = request.user  # Get the logged-in user

    # Check if the customer already exists for this user
    customer, created = Customer.objects.get_or_create(user=user, defaults={"name": user.username, "email": user.email})

    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            form.save()
            return redirect("customer_dashboard")  # Redirect to customer dashboard after saving

    else:
        form = CustomerForm(instance=customer)  # Prefill form with existing data

    return render(request, "create_customer.html", {"form": form, "customer": customer})

Step 2: Update the `Customer` Model (`models.py`)

Ensure your Customer model correctly links to CustomUser:

python
from django.db import models
from accounts.models import CustomUser  

class Customer(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True)
    name = models.CharField(max_length=100)
    email = models.EmailField(unique=True)
    phone = models.CharField(max_length=15, blank=True, null=True)

    def __str__(self):
        return self.name

Run migrations:

bash
python manage.py makemigrations billing
python manage.py migrate

Step 3: Modify `CustomerForm` (`forms.py`)

Exclude the user field so it's automatically assigned in the view:

python
from django import forms
from .models import Customer

class CustomerForm(forms.ModelForm):
    class Meta:
        model = Customer
        fields = ["name", "email", "phone"]

Step 4: Modify the `create_customer.html` Template

Make sure it displays the logged-in user's details properly:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Create Customer</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 50%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        input[type="text"], input[type="email"], input[type="number"], button {
            padding: 12px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        input[type="text"], input[type="email"], input[type="number"] {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            padding: 12px;
            font-size: 16px;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Customer Details</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}

        <button type="submit">Save Customer</button>
    </form>
</div>

</body>
</html>

Step 5: Add URL Path (`urls.py` in `billing`)

python
from django.urls import path
from .views import create_customer

urlpatterns = [
    path("create_customer/", create_customer, name="create_customer"),
]

Step 6: Add a Button in the Navbar or Dashboard

To allow users to create or view their customer profile, add a link:

html
<a href="{% url 'create_customer' %}">
    <button>My Customer Profile</button>
</a>

Expected Behavior

If the user has no customer profile, a new one is created using their username and email.
If the customer profile exists, their details will be pre-filled in the form.
Users can update their details and save changes.
After saving, they are redirected to the customer dashboard.

This ensures each user is linked to their own customer profile without errors. Let me know if you need any tweaks! 🚀

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Create Customer</title> <style> body { font-family: Arial, sans-serif; background-color: #f7f7f7; margin: 0; padding: 0; } .container { width: 50%; margin: 40px auto; background-color: #fff; padding: 30px; box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } form { display: flex; flex-direction: column; gap: 20px; } label { font-size: 16px; color: #333; } input[type="text"], input[type="email"], input[type="number"], button { padding: 12px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } input[type="text"], input[type="email"], input[type="number"] { width: 100%; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; padding: 12px; font-size: 16px; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } .form-group { display: flex; flex-direction: column; } </style> </head> <body> <div class="container"> <h1>Customer Details</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <button type="submit">Save Customer</button> </form> </div> </body> </html> after saving it shuld take you to the next page which is add vehicle

To ensure that after saving the customer details, the user is redirected to the "Add Vehicle" page, we need to update the create_customer view in views.py.

Step 1: Update `create_customer` View in `views.py`

Modify the view to redirect to the "Add Vehicle" page after successfully saving the form.

python
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .models import Customer
from .forms import CustomerForm

@login_required
def create_customer(request):
    user = request.user  # Get the logged-in user

    # Check if the customer already exists for this user
    customer, created = Customer.objects.get_or_create(user=user, defaults={"name": user.username, "email": user.email})

    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            form.save()
            return redirect("add_vehicle")  # Redirect to the add vehicle page

    else:
        form = CustomerForm(instance=customer)  # Prefill form with existing data

    return render(request, "create_customer.html", {"form": form, "customer": customer})

Step 2: Add URL Path for "Add Vehicle" in `urls.py`

Ensure that you have the correct URL pattern for add_vehicle in billing/urls.py:

python
from django.urls import path
from .views import create_customer, add_vehicle  # Import add_vehicle view

urlpatterns = [
    path("create_customer/", create_customer, name="create_customer"),
    path("add_vehicle/", add_vehicle, name="add_vehicle"),  # Add this route
]

Step 3: Ensure the `add_vehicle` View Exists

If the "Add Vehicle" page does not exist yet, create a new view in views.py:

python
@login_required
def add_vehicle(request):
    return render(request, "add_vehicle.html")  # Create this template

Step 4: Update the `create_customer.html` Template

No changes are needed in create_customer.html, as the redirect will happen automatically after submission.

Step 5: Create `add_vehicle.html`

Create the add_vehicle.html file inside the billing/templates/ directory.

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Add Vehicle</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f7f7f7;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 50%;
            margin: 40px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        input[type="text"], button {
            padding: 12px;
            font-size: 14px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        input[type="text"] {
            width: 100%;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            cursor: pointer;
            padding: 12px;
            font-size: 16px;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Add Vehicle for {{ customer.name }}</h1>
    <form method="post">
        {% csrf_token %}
        
        {{ form.as_p }}

        <button type="submit">Add Vehicle</button>
    </form>
</div>

</body>
</html>

Expected Behavior

User fills out the customer form on create_customer.html.
After clicking "Save Customer", the form is processed.
The user is redirected to add_vehicle.html, where they can add vehicle details.

This setup ensures a smooth transition from customer creation to vehicle registration. 🚗 🚀 Let me know if you need any tweaks!

from django.urls import path from .views import * urlpatterns = [ path('', billing_home, name='billing'), path('create_customer/',create_customer, name='create_customer'), path('create_vehicle/<int:customer_id>/', create_vehicle, name='create_vehicle'), path('create_billing/<int:vehicle_id>/',create_billing, name='create_billing'), path('generate_invoice/<int:billing_id>/',generate_invoice, name='generate_invoice'), ] NoReverseMatch at /billing/create_customer/ Reverse for 'create_vehicle' with no arguments not found. 1 pattern(s) tried: ['billing/create_vehicle/(?P<customer_id>[0-9]+)/\\Z'] Request Method: POST Request URL: http://127.0.0.1:8000/billing/create_customer/ Django Version: 5.1.7 Exception Type: NoReverseMatch Exception Value: Reverse for 'create_vehicle' with no arguments not found. 1 pattern(s) tried: ['billing/create_vehicle/(?P<customer_id>[0-9]+)/\\Z'] Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\urls\resolvers.py, line 831, in _reverse_with_prefix Raised during: billing.views.create_customer Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 09:57:50 +0000

The error "NoReverseMatch for 'create_vehicle' with no arguments" occurs because your create_vehicle URL pattern requires a customer_id, but your redirect does not provide it.

Fix in `views.py`

Modify the create_customer view to include the customer.id when redirecting.

python
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .models import Customer
from .forms import CustomerForm

@login_required
def create_customer(request):
    user = request.user  # Get the logged-in user

    # Check if a customer already exists for this user, or create one
    customer, created = Customer.objects.get_or_create(user=user, defaults={"name": user.username, "email": user.email})

    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            form.save()
            return redirect("create_vehicle", customer_id=customer.id)  # Redirect with customer ID

    else:
        form = CustomerForm(instance=customer)

    return render(request, "create_customer.html", {"form": form, "customer": customer})

Why This Works

✅ customer.id ensures that the redirect provides the required customer_id.
✅ The URL pattern path('create_vehicle/<int:customer_id>/') is now correctly matched.

Alternative: Check URL Pattern

Make sure the correct URL pattern exists in urls.py:

python
path('create_vehicle/<int:customer_id>/', create_vehicle, name='create_vehicle'),

Now, Expected Behavior

The user submits the "Create Customer" form.
The form saves the customer details.
The user is redirected to /billing/create_vehicle/{customer_id}/, where they can add a vehicle.

🚀 This should resolve your issue! Let me know if you need any refinements.

after adding vehicle we go to the following page <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } form { display: flex; flex-direction: column; gap: 15px; } label { font-size: 16px; color: #333; } select, input[type="number"], button { padding: 10px; font-size: 14px; border: 1px solid #ccc; border-radius: 4px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; cursor: pointer; transition: background-color 0.3s ease; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Generate Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <form method="post"> {% csrf_token %} {{ form.as_p }} <label for="service">Select Service:</label> <select name="service"> <option value="" selected>Select a Service (Optional)</option> {% for service in services %} <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option> {% endfor %} </select> {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part"> <option value="" selected>Select a Part (Optional)</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> {% endif %} <button type="submit">Calculate Total</button> </form> </div> </body> </html> the logic in this page is not appealling once we booked for a service then that service is what we are supposed to get in the garage hence that is what i want billed here in create billing you get me?

I get you! Instead of letting the user select a service again, the system should automatically fetch and display the service that was booked for the vehicle. That way, billing is straightforward and reflects the actual service the customer came for.

New Billing Logic

Fetch the booked service for the vehicle – When the customer arrives, the system should check the database for the service they originally booked.
Display only that service – Instead of a dropdown, just show the details of the booked service.
Optional parts selection – If parts are required for the service, the user can still select those.

Next Steps

Modify create_billing to fetch the booked service automatically.
Update the billing page to only display the booked service instead of a dropdown.

Does this approach work for you? 🚀

Great! Here’s how we can implement this:

Changes to `create_billing` View

Instead of showing a dropdown, we fetch the booked service for the vehicle.
The page will display:
- The service name and cost (fetched from the database).
- An optional parts dropdown (if parts are needed).
- The total cost (service + selected parts).

Updated `create_billing` View

python
from django.shortcuts import render, get_object_or_404, redirect
from .models import Vehicle, Billing, Service, Part

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the booked service for the vehicle (assuming vehicle has a booked_service field)
    booked_service = vehicle.booked_service  

    # Get all optional parts
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record
        billing = Billing.objects.create(
            vehicle=vehicle,
            service=booked_service,
            part=selected_part,
            total_cost=total_cost
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Updated `create_billing.html` Template

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        .info {
            background: #f0f0f0;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            padding: 12px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        {% endif %}

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>

</body>
</html>

What’s Changed?

✅ No service selection – The page automatically fetches the booked service.
✅ Service details displayed – The service name and cost are shown in a simple info box.
✅ Optional parts selection – If parts are needed, the user can add them.
✅ Total cost calculation – The system adds up service + optional part cost.
✅ Redirects to invoice – Once billing is created, it moves to the invoice page.

Next Steps

Does the vehicle model already have a booked_service field? If not, we should add it!
If you have multiple services booked per vehicle, we may need to refine how we fetch the latest booked service.

Let me know if this works! 🚀

AttributeError at /billing/create_billing/7/ 'Vehicle' object has no attribute 'booked_service' Request Method: GET Request URL: http://127.0.0.1:8000/billing/create_billing/7/ Django Version: 5.1.7 Exception Type: AttributeError Exception Value: 'Vehicle' object has no attribute 'booked_service' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 47, in create_billing Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 10:07:33 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 47, in create_billing booked_service = vehicle.booked_service ^^^^^^^^^^^^^^^^^^^^^^ … Local vars Variable Value request <WSGIRequest: GET '/billing/create_billing/7/'> vehicle <Vehicle: Vehicle object (7)> vehicle_id 7

The error 'Vehicle' object has no attribute 'booked_service' means that the Vehicle model doesn't have a booked_service field.

We need to determine how a vehicle is linked to a service.

Solution 1: Add `booked_service` to `Vehicle` Model

If a vehicle always has one booked service, add a ForeignKey field:

Update `models.py`

python
class Vehicle(models.Model):
    owner = models.ForeignKey(Customer, on_delete=models.CASCADE)
    make = models.CharField(max_length=100)
    model = models.CharField(max_length=100)
    booked_service = models.ForeignKey(Service, on_delete=models.SET_NULL, null=True, blank=True)

    def __str__(self):
        return f"{self.make} {self.model}"

Apply Migrations

sh
python manage.py makemigrations
python manage.py migrate

Update View (`create_billing`)

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    if not vehicle.booked_service:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = vehicle.booked_service
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        billing = Billing.objects.create(
            vehicle=vehicle,
            service=booked_service,
            part=selected_part,
            total_cost=total_cost
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Solution 2: Fetch the Latest Booking

If a vehicle can have multiple bookings, we should fetch the latest one instead.

Update View (`create_billing`)

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the latest booked service
    latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        billing = Billing.objects.create(
            vehicle=vehicle,
            service=booked_service,
            part=selected_part,
            total_cost=total_cost
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Which One Should You Use?

✅ Solution 1 if a vehicle has only one booked service at a time.
✅ Solution 2 if a vehicle has multiple bookings and we need the latest one.

Let me know which works best for your setup! 🚀

Your current Vehicle model doesn't have a reference to a booked service. If you want to bill the service a customer booked, you'll need to establish a relationship between a Vehicle and its booked Service.

🚀 Solution: Add a Booking Model

Instead of adding booked_service directly to Vehicle, it's better to create a Booking model that tracks which service was booked for each vehicle.

Update `models.py`

python
class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

class Booking(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)  # Track when the booking was made

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

Apply Migrations

Run:

sh
python manage.py makemigrations
python manage.py migrate

🛠️ Fix `create_billing` View

Now, in your create_billing view, fetch the latest booking for the vehicle:

python
from django.shortcuts import get_object_or_404, redirect, render
from django.http import HttpResponse
from .models import Vehicle, Booking, Part, Billing

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        billing = Billing.objects.create(
            vehicle=vehicle,
            service=booked_service,
            part=selected_part,
            total_cost=total_cost
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

🎯 Why This Works

Instead of adding booked_service to Vehicle, we track bookings separately.
Booking ensures a vehicle can have multiple bookings over time.
We get the latest booking when creating a billing.

Now, when you call /billing/create_billing/{vehicle_id}/, it will correctly fetch the most recent booked service for that vehicle.

Let me know if this fits your use case! 🚀

Your models are well-structured, but there's one key issue: there is no link between a Vehicle and the service it has booked.

To fix this, we should add a Booking model to track which service has been booked for a vehicle before it gets billed.

🛠️ What to Add?

1️⃣ Add a `Booking` Model

Since a vehicle can have multiple service bookings over time, we need a model to store bookings.

python
class Booking(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)  # Timestamp of booking

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

✅ Why? This ensures that only booked services are billed.

2️⃣ Modify `Billing` Model

Right now, Billing has service and part, but there's no connection to a booked service.
Instead of linking Billing to Service, link it to Booking:

🔹 Change `Billing` like this:

python
class Billing(models.Model):
    booking = models.ForeignKey(Booking, on_delete=models.CASCADE)  # Link to Booking
    part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True)
    part_quantity = models.IntegerField(default=1)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

    def calculate_total(self):
        # Calculate total: service cost + (part cost * part quantity, if part exists)
        total = self.booking.service.cost
        if self.part:
            total += self.part.cost * self.part_quantity
        return total

    def save(self, *args, **kwargs):
        # Ensure total_cost is calculated before saving
        if not self.total_cost:
            self.total_cost = self.calculate_total()
        super(Billing, self).save(*args, **kwargs)

✅ Why? Now, Billing always references a booked service, so no unbooked services can be billed.

3️⃣ Apply Migrations

Run the following in the terminal:

sh
python manage.py makemigrations
python manage.py migrate

📌 Final Changes & Flow

A customer books a service for their vehicle → Booking is created.
When billing, fetch the most recent Booking for that vehicle.
Billing now links to Booking instead of Service, ensuring only booked services are billed.

🚀 Update `create_billing` View

Modify the view to use the latest booking instead of picking a service manually.

python
from django.shortcuts import get_object_or_404, redirect, render
from django.http import HttpResponse
from .models import Vehicle, Booking, Part, Billing

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()

    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        total_cost = latest_booking.service.cost + (selected_part.cost if selected_part else 0)

        billing = Billing.objects.create(
            booking=latest_booking,
            part=selected_part,
            total_cost=total_cost
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": latest_booking.service,  # Pass booked service
        "parts": parts
    })

🔥 Benefits of This Approach

✅ No Manual Service Selection – Only booked services get billed.
✅ Multiple Bookings Supported – A vehicle can have multiple services over time.
✅ Billing is Linked to Booking – No risk of billing a service that wasn’t booked.

Let me know if this makes sense or if you need adjustments! 🚀

This happens because your existing Billing table has records and you just added a new required (ForeignKey) field: booking. The database doesn't know what value to use for the old rows.

🔧 Fix: Choose an Option

1️⃣ If You Don't Have Important Billing Data:

Select option 1 and enter a one-off default.
You can use any Booking ID from your booking table or just enter NULL (if allowed).

Example:

vbnet
Select an option: 1
Please enter the default value now, as valid Python:
None

2️⃣ If You Need Data Integrity (Recommended):

Choose option 2 to edit models.py manually and set null=True, blank=True in Billing:

python
class Billing(models.Model):
    booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True)  # Allow existing records
    part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True)
    part_quantity = models.IntegerField(default=1)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

Then run migrations again:

sh
python manage.py makemigrations
python manage.py migrate

💡 Best Practice?

✅ Option 2 (edit models.py) is better because it doesn't force a fake default value and lets you manually update old records later.

Once the migration is done, you can update old Billing records using Django Shell:

sh
python manage.py shell

python
from billing.models import Billing, Booking

# Set a valid booking for old billing records
default_booking = Booking.objects.first()  # Get any booking
Billing.objects.filter(booking__isnull=True).update(booking=default_booking)

Then, you can remove null=True later to make booking required.

🚀 Next Steps

Pick option 2, modify the model, and run migrations.
If you already picked 1, manually update Billing records to add a valid booking.

Let me know if you need help! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations It is impossible to add a non-nullable field 'booking' to billing without specifying a default. This is because the database needs something to populate existing rows. Please select a fix: 1) Provide a one-off default now (will be set on all existing rows with a null value for this column) 2) Quit and manually define a default value in models.py. Select an option: 1 Please enter the default value as valid Python. The datetime and django.utils.timezone modules are available, so it is possible to provide e.g. timezone.now as a value. Type 'exit' to exit this prompt >>>??

Since booking is a ForeignKey, Django expects you to provide a valid Booking ID from your database.

What You Should Do:

✅ Enter the ID of an existing Booking record (e.g., if id=1 exists, type 1 and press Enter):

python-repl
>>> 1

If You Don’t Know a Booking ID:

1️⃣ Open Django shell and check existing Booking IDs:

sh
python manage.py shell

python
from billing.models import Booking
print(Booking.objects.values_list('id', flat=True))  # Shows all IDs

If it prints [1, 2, 3], you can enter 1 in the migration prompt.

2️⃣ If There Are No Bookings, cancel (Ctrl + C) and:

Open models.py, update Billing like this:

python
booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True)

Then run migrations again:

sh
python manage.py makemigrations
python manage.py migrate

Let me know if you get stuck! 🚀

Type 'exit' to exit this prompt >>> 1 Migrations for 'billing': billing\migrations\0003_remove_billing_service_remove_billing_vehicle_and_more.py - Remove field service from billing - Remove field vehicle from billing ~ Alter field part on billing ~ Alter field part_quantity on billing + Create model Booking + Add field booking to billing (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: Applying billing.0003_remove_billing_service_remove_billing_vehicle_and_more...Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\manage.py", line 22, in <module> main() File "C:\Users\lau\Desktop\Projects\garage_system\manage.py", line 18, in main execute_from_command_line(sys.argv) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\__init__.py", line 442, in execute_from_command_line utility.execute() File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\__init__.py", line 436, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\base.py", line 413, in run_from_argv self.execute(*args, **cmd_options) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\base.py", line 459, in execute output = self.handle(*args, **options) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\base.py", line 107, in wrapper res = handle_func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\commands\migrate.py", line 357, in handle post_migrate_state = executor.migrate( ^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\migrations\executor.py", line 135, in migrate state = self._migrate_all_forwards( ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\migrations\executor.py", line 167, in _migrate_all_forwards state = self.apply_migration( ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\migrations\executor.py", line 252, in apply_migration with self.connection.schema_editor( File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\schema.py", line 39, in __exit__ self.connection.check_constraints() File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 298, in check_constraints raise IntegrityError( django.db.utils.IntegrityError: The row in table 'billing_billing' with primary key '1' has an invalid foreign key: billing_billing.booking_id contains a value '1' that does not have a corresponding value in billing_booking.id. (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

Issue: Foreign Key Constraint Error

Django is trying to link Billing.booking_id to a Booking that does not exist in the billing_booking table. The value 1 was assigned during migrations, but there's no Booking record with id=1 in the database.

Fix: Reset Migrations and Database Data

Since the migration altered the structure significantly, follow these steps:

1. Delete Migration Files (Except `init.py`)

Run:

sh
rm billing/migrations/0003_*.py

Or manually delete the migration file:
📂 billing/migrations/0003_remove_billing_service_remove_billing_vehicle_and_more.py

2. Reset Database (If You Can)

If you don’t mind losing existing data, delete db.sqlite3:

sh
rm db.sqlite3

Then, recreate the database:

sh
python manage.py migrate

3. Create a New `Booking` Entry

If you want to keep the database, manually create a Booking record:

sh
python manage.py shell

python
from billing.models import Booking
Booking.objects.create()  # This creates a valid Booking instance

Then retry:

sh
python manage.py migrate

4. Run Migrations Again

After fixing the foreign key issue:

sh
python manage.py makemigrations
python manage.py migrate

Why This Happened?

You added a new required ForeignKey (booking) in Billing,
But Django assigned booking_id=1 during migration without ensuring Booking(id=1) exists.
SQLite doesn’t allow foreign keys pointing to non-existent records.

After following these steps, everything should work. Let me know if you need more help! 🚀

The above exception was the direct cause of the following exception: Traceback (most recent call last): File "<console>", line 1, in <module> File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 679, in create obj.save(force_insert=True, using=self.db) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 892, in save self.save_base( File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 998, in save_base updated = self._save_table( ^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 1161, in _save_table results = self._do_insert( ^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 1202, in _do_insert return manager._insert( ^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1847, in _insert return query.get_compiler(using=using).execute_sql(returning_fields) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\compiler.py", line 1836, in execute_sql cursor.execute(sql, params) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 122, in execute return super().execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 79, in execute return self._execute_with_wrappers( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 92, in _execute_with_wrappers return executor(sql, params, many, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 100, in _execute with self.db.wrap_database_errors: File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ django.db.utils.OperationalError: no such table: billing_booking >>>

Issue: `billing_booking` Table Does Not Exist

The error "no such table: billing_booking" means that Django is trying to create a Booking record, but the billing_booking table does not exist in your database.

Steps to Fix

Follow these steps to ensure the database structure is correct:

1. Delete All Migration Files (Except `init.py`)

Since the database is in an inconsistent state, delete migration files only for the billing app:

sh
rm billing/migrations/00*.py

Or manually delete all migration files inside billing/migrations/, except __init__.py.

2. Delete the Database (If You Can)

If you don’t have important data, delete the database file:

sh
rm db.sqlite3

3. Recreate Migrations and Apply Them

Now, generate new migrations:

sh
python manage.py makemigrations

Then, apply them:

sh
python manage.py migrate

4. Create a `Booking` Record (If Needed)

After migration, enter Django shell:

sh
python manage.py shell

Then, run:

python
from billing.models import Booking
Booking.objects.create()  # Creates a new booking record

Exit the shell:

python
exit()

Why This Happened?

The migration process altered the database structure.
The table billing_booking was never created, but Django tried inserting data into it.
Deleting migrations and running them fresh fixes the inconsistency.

After these steps, your system should be working properly! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> rm billing/migrations/00*.py (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations >> Migrations for 'billing': billing\migrations\0001_initial.py + Create model Booking + Create model Part + Create model Service + Create model Customer + Create model Billing + Add field service to booking + Create model Vehicle + Add field vehicle to booking (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate >> Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: No migrations to apply. (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

Great! Your migrations are now clean and applied correctly. Since it says "No migrations to apply," that means Django recognizes the current database schema as up to date.

Now, try running your application and test if the error is resolved. If you still encounter issues:

Restart the server:
```
sh
python manage.py runserver
```
Test the billing feature again.

If there's still an issue, let me know what error comes up! 🚀

The error "no such column: billing_billing.booking_id" means that Django is trying to reference a column that does not exist in your database.

Possible Causes:

The database is out of sync – Even though you deleted migrations and recreated them, Django might still be using old data.
A stale database file – Since you're using SQLite, an outdated db.sqlite3 file could be the issue.
Django’s migration history is corrupted – The migration state in Django might be broken.

Steps to Fix:

1. Delete the SQLite Database (If You Don't Have Important Data)

If you don't have critical data in your database, delete it and recreate the migrations:

sh
rm db.sqlite3  # On Windows PowerShell: Remove-Item db.sqlite3
python manage.py migrate
python manage.py createsuperuser  # Recreate admin user if needed

Then restart your server and check if the issue is resolved.

2. Fake the Migrations (If You Want to Keep Your Data)

If you want to keep existing data, try forcing Django to recognize the migrations:

sh
python manage.py makemigrations billing
python manage.py migrate billing --fake

Then restart your server.

3. Manually Fix the Schema (If the Above Steps Fail)

Open SQLite shell:
```
sh
python manage.py dbshell
```
Check if the billing_billing table has a booking_id column:
```
sql
PRAGMA table_info(billing_billing);
```
If it's missing, you may need to manually add it or reset migrations.

Try these steps and let me know what happens! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations Migrations for 'billing': billing\migrations\0001_initial.py + Create model Booking + Create model Part + Create model Service + Create model Customer + Create model Billing + Add field service to booking + Create model Vehicle + Add field vehicle to booking (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate >> Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: No migrations to apply. (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

Your migrations ran successfully, but the error "no such column: billing_billing.booking_id" suggests that Django still expects a column that is missing from the database.

Next Steps:

1️⃣ Check if the `billing_billing` table exists

Run the following command to access the SQLite shell:

sh
python manage.py dbshell

Then, check if the billing_billing table exists:

sql
.tables;

If the table is missing, it means the database did not fully apply migrations.

2️⃣ Check if the `booking_id` column exists

Run:

sql
PRAGMA table_info(billing_billing);

If booking_id is missing, it means Django did not create the column properly.

🔥 Possible Fixes

✅ Option 1: Fake Migrations

If the table exists but the column is missing, try:

sh
python manage.py migrate billing --fake

✅ Option 2: Reset Migrations and Database

If migrations are still failing, delete the SQLite database and redo the setup:

sh
rm db.sqlite3  # Windows PowerShell: Remove-Item db.sqlite3
python manage.py migrate
python manage.py createsuperuser  # Recreate admin user if needed

Then restart your server.

Try these and let me know what happens! 🚀

You're in the Django shell, but .tables; is an SQLite command, which won't work here.

✅ Use the Django Database Shell Instead

Run this in your terminal (not the Python shell):

sh
python manage.py dbshell

Then, inside the database shell, run:

sql
.tables;

If python manage.py dbshell doesn’t work (especially on Windows), use the SQLite CLI instead:

Exit the Django shell by typing exit().
Run this in your terminal:
```
sh
sqlite3 db.sqlite3
```

Then, run:

sql
.tables

and

sql
PRAGMA table_info(billing_billing);

If SQLite is not installed separately on Windows, you can also check your database by using the SQLite Browser tool.

Let me know what you find! 🚀

Alright! Since we are using the Django shell, let's check if the billing_billing table exists and what fields it has.

Step 1: Start the Django Shell

You've already done this with:

sh
python manage.py shell

Step 2: Check If the Table Exists

Run the following command in the shell:

python
from django.db import connection
cursor = connection.cursor()
cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")
tables = cursor.fetchall()
for table in tables:
    print(table[0])

This will print all the tables in your SQLite database. Look for billing_billing in the list.

Step 3: Check the Columns of `billing_billing`

If the table exists, run:

python
cursor.execute("PRAGMA table_info(billing_billing);")
columns = cursor.fetchall()
for column in columns:
    print(column)

This will show all columns in the billing_billing table.

Step 4: Check for the `booking_id` Column

If booking_id is missing, that means the migration wasn't applied correctly. In that case, we might need to reset migrations by:

Deleting db.sqlite3 (this will remove all data 😬).

Running:

sh
python manage.py makemigrations
python manage.py migrate

Run the steps and let me know what you find! 🚀

<django.db.backends.sqlite3.base.SQLiteCursorWrapper object at 0x0000020C87392C30> >>> tables = cursor.fetchall() >>> for table in tables: ... print(table[0]) ... django_migrations sqlite_sequence django_content_type auth_group_permissions auth_permission auth_group accounts_customuser accounts_customuser_groups accounts_customuser_user_permissions django_admin_log core_booking core_service django_session billing_part billing_service billing_vehicle billing_billing insurance_vehicle insurance_insuranceclaim insurance_insurancepolicy billing_customer >>>

Alright! The billing_billing table exists, which means the database recognizes it. Now, let's check if the booking_id column exists in billing_billing.

Step 2: Check Columns in `billing_billing`

Run this in the Django shell:

python
cursor.execute("PRAGMA table_info(billing_billing);")
columns = cursor.fetchall()
for column in columns:
    print(column)

This will display all the columns in billing_billing. Look for booking_id in the list.

Possible Outcomes

If booking_id exists ✅
- The table is fine, and we need to check why Django is still throwing the error.
If booking_id does NOT exist ❌
- The migration wasn't applied correctly, and we'll need to reset the migrations.

Run the command and let me know what you find! 🚀

>>> cursor.execute("PRAGMA table_info(billing_billing);") <django.db.backends.sqlite3.base.SQLiteCursorWrapper object at 0x0000020C87392C30> >>> columns = cursor.fetchall() >>> for column in columns: ... print(column) ... (0, 'id', 'INTEGER', 1, None, 1) (1, 'part_quantity', 'INTEGER', 1, None, 0) (2, 'total_cost', 'decimal', 0, None, 0) (3, 'payment_method', 'varchar(50)', 1, None, 0) (4, 'payment_amount', 'decimal', 1, None, 0) (5, 'part_id', 'bigint', 1, None, 0) (6, 'service_id', 'bigint', 1, None, 0) (7, 'vehicle_id', 'bigint', 1, None, 0) >>>

Analysis

The billing_billing table does NOT have booking_id, which explains why Django is throwing the error.

Solution: Reset and Apply Migrations Again

To fix this, we'll completely reset the migrations and apply fresh migrations.

Step 1: Delete Existing Migrations

Run this in PowerShell or Command Prompt:

sh
rm billing/migrations/00*.py

(If rm doesn’t work, use del billing\migrations\00*.py on Windows.)

Then, remove the SQLite database (only if you're not worried about losing data):

sh
rm db.sqlite3

Step 2: Recreate Migrations

Now, create fresh migrations:

sh
python manage.py makemigrations billing

Then, apply them:

sh
python manage.py migrate

Step 3: Verify Table Structure

After migrating, open the Django shell again:

sh
python manage.py shell

Run:

python
cursor.execute("PRAGMA table_info(billing_billing);")
columns = cursor.fetchall()
for column in columns:
    print(column)

This time, you should see booking_id in the list.

Let me know if you need help! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations billing >> Migrations for 'billing': billing\migrations\0001_initial.py + Create model Booking + Create model Part + Create model Service + Create model Customer + Create model Billing + Add field service to booking + Create model Vehicle + Add field vehicle to booking (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate >> Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: No migrations to apply. (venv) PS C:\Users\lau\Desktop\Projects\garage_system> its not applying the migrations

Issue: Migrations Not Applying

Django says "No migrations to apply", meaning the database still doesn’t have the changes.

Solution: Force Django to Reapply Migrations

Since billing_billing still lacks booking_id, let's force Django to recognize the migration properly.

Step 1: Fake Reset Migrations

Run the following command to mark all migrations as unapplied:

sh
python manage.py migrate billing zero

This resets the billing app's migration history.

Step 2: Delete Previous Migrations Manually

Remove all migration files from the billing/migrations/ folder EXCEPT __init__.py:

sh
rm billing/migrations/00*.py

(If rm doesn’t work, use del billing\migrations\00*.py on Windows.)

Step 3: Recreate Migrations

Generate fresh migrations:

sh
python manage.py makemigrations billing

Step 4: Apply Migrations

Now apply them:

sh
python manage.py migrate billing

Verify Table Structure

Once migrations are applied, check if booking_id exists:

sh
python manage.py shell

Then run:

python
from django.db import connection
cursor = connection.cursor()
cursor.execute("PRAGMA table_info(billing_billing);")
columns = cursor.fetchall()
for column in columns:
    print(column)

If you see booking_id, then everything is set!

Let me know if you still run into issues! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> rm billing/migrations/00*.py >> (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations billing >> Migrations for 'billing': billing\migrations\0001_initial.py + Create model Booking + Create model Part + Create model Service + Create model Customer + Create model Billing + Add field service to booking + Create model Vehicle + Add field vehicle to booking (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate >> Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: No migrations to apply. (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate billing zero >> Operations to perform: Unapply all migrations: billing Running migrations: Rendering model states... DONE Unapplying billing.0001_initial...Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sqlite3.OperationalError: no such table: billing_booking The above exception was the direct cause of the following exception: Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\manage.py", line 22, in <module> main() File "C:\Users\lau\Desktop\Projects\garage_system\manage.py", line 18, in main execute_from_command_line(sys.argv) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\__init__.py", line 442, in execute_from_command_line utility.execute() File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\__init__.py", line 436, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\base.py", line 413, in run_from_argv self.execute(*args, **cmd_options) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\base.py", line 459, in execute output = self.handle(*args, **options) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\base.py", line 107, in wrapper res = handle_func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\commands\migrate.py", line 357, in handle post_migrate_state = executor.migrate( ^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\migrations\executor.py", line 141, in migrate state = self._migrate_all_backwards(plan, full_plan, fake=fake) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\migrations\executor.py", line 219, in _migrate_all_backwards self.unapply_migration(states[migration], migration, fake=fake) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\migrations\executor.py", line 282, in unapply_migration state = migration.unapply(state, schema_editor) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\migrations\migration.py", line 193, in unapply operation.database_backwards( File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\migrations\operations\fields.py", line 120, in database_backwards schema_editor.remove_field( File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\schema.py", line 346, in remove_field self._remake_table(model, delete_field=field) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\schema.py", line 246, in _remake_table self.execute( File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\base\schema.py", line 202, in execute cursor.execute(sql, params) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 122, in execute return super().execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 79, in execute return self._execute_with_wrappers( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 92, in _execute_with_wrappers return executor(sql, params, many, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 100, in _execute with self.db.wrap_database_errors: File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ django.db.utils.OperationalError: no such table: billing_booking (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

It looks like Django is trying to undo migrations, but the table billing_booking doesn't exist anymore. This means the database schema is out of sync with Django's migration history.

Solution: Fully Reset Migrations and Database

Since your migrations aren't applying properly, let's completely reset them.

Step 1: Delete Migration Files

Manually remove all migration files except __init__.py for billing and any other affected apps:

sh
rm billing/migrations/00*.py
rm core/migrations/00*.py

(On Windows, use del instead of rm.)

Step 2: Delete the SQLite Database (for local development)

Since the database schema is corrupted, remove the existing SQLite database file:

sh
rm db.sqlite3

(On Windows, use del db.sqlite3.)

Step 3: Recreate Migrations

Now generate fresh migrations:

sh
python manage.py makemigrations

Step 4: Apply Migrations

Apply all migrations again:

sh
python manage.py migrate

Step 5: Create a Superuser (if needed)

Since we wiped the database, create a superuser to access Django Admin:

sh
python manage.py createsuperuser

Why This Works

Deleting db.sqlite3 removes all inconsistencies.
Removing old migrations forces Django to regenerate them properly.
A fresh database ensures no missing tables or columns.

Try this and let me know if you hit any issues! 🚀

Your models look well-structured, but I see a few potential issues that could cause migration errors. Here’s what you should fix before running migrations:

Issues & Fixes

1. `Billing` Model: `booking` is missing in the database

Your error (no such column: billing_billing.booking_id) suggests that the Billing model didn’t have booking in the database schema.
✅ Fix: Ensure billing is correctly linked to booking before migrating. Your billing model already has booking, so the issue is likely due to incomplete migrations.

2. `total_cost` should always be calculated

Right now, total_cost is nullable (null=True, blank=True), but it should always have a value.
✅ Fix: Change this field to default=0.00 to avoid potential NULL issues in the database.

3. `str()` Method in `Billing`

It’s helpful to include a __str__ method for debugging and Django Admin.
✅ Fix: Add a __str__ method to Billing for better readability.

Final Updated Model

python
from django.db import models
from accounts.models import CustomUser

class Customer(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True)
    name = models.CharField(max_length=100)
    email = models.EmailField()
    phone = models.CharField(max_length=15)

    def __str__(self):
        return self.name

class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    make = models.CharField(max_length=50)
    model = models.CharField(max_length=50)
    registration_number = models.CharField(max_length=20)

    def __str__(self):
        return f"{self.make} {self.model} - {self.registration_number}"

class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

class Part(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

class Booking(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)  # Timestamp of booking

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

class Billing(models.Model):
    booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True)
    part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True)
    part_quantity = models.IntegerField(default=1)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, default=0.00)  # Ensuring no NULL values
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

    def calculate_total(self):
        total = self.booking.service.cost if self.booking else 0  # Prevents crashes if booking is NULL
        if self.part:
            total += self.part.cost * self.part_quantity
        return total

    def save(self, *args, **kwargs):
        self.total_cost = self.calculate_total()  # Ensure total cost is always set
        super().save(*args, **kwargs)

    def __str__(self):
        return f"Billing for {self.booking} - Total: KSH {self.total_cost}"

Now You Can Run Migrations

1️⃣ Delete old migrations (if they exist):

sh
rm billing/migrations/00*.py
rm db.sqlite3  # Only if using SQLite

2️⃣ Recreate migrations

sh
python manage.py makemigrations

3️⃣ Apply migrations

sh
python manage.py migrate

4️⃣ Create superuser (if needed)

sh
python manage.py createsuperuser

Why This Works

✅ Ensures billing_billing.booking_id exists in the schema.
✅ Prevents NULL values in total_cost.
✅ Prevents crashes if booking is None.
✅ Better readability with __str__() methods.

Try this and let me know if anything breaks! 🚀

You can check if your migrations were applied successfully using the following methods:

1. Check the Migration Table

Run this command in the Django shell to see all applied migrations:

sh
python manage.py showmigrations

Look for the billing app—it should have [X] next to the migration, meaning it was applied.

2. Check the Database Tables

Open the Django shell:

sh
python manage.py dbshell

Then, run this SQL query to list tables:

sql
.tables

For PostgreSQL, use:

sql
SELECT tablename FROM pg_catalog.pg_tables WHERE schemaname = 'public';

You should see billing_billing, billing_booking, etc.

3. Inspect Table Structure

Run:

sh
python manage.py shell

Then, enter:

python
from django.db import connection
cursor = connection.cursor()
cursor.execute("PRAGMA table_info(billing_billing);")  # For SQLite
columns = cursor.fetchall()
for column in columns:
    print(column)

For PostgreSQL:

python
cursor.execute("SELECT column_name FROM information_schema.columns WHERE table_name='billing_billing';")
print(cursor.fetchall())

This will show if your table and fields exist.

4. Query the Database

Try fetching some data:

sh
python manage.py shell

Then, run:

python
from billing.models import Billing
print(Billing.objects.all())  # Should return an empty queryset [] if no records exist

If you still don't see the expected tables, try deleting db.sqlite3 and running migrations again. 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py showmigrations >> accounts [X] 0001_initial admin [X] 0001_initial [X] 0002_logentry_remove_auto_add [X] 0003_logentry_add_action_flag_choices auth [X] 0001_initial [X] 0002_alter_permission_name_max_length [X] 0003_alter_user_email_max_length [X] 0004_alter_user_username_opts [X] 0005_alter_user_last_login_null [X] 0006_require_contenttypes_0002 [X] 0007_alter_validators_add_error_messages [X] 0008_alter_user_username_max_length [X] 0009_alter_user_last_name_max_length [X] 0010_alter_group_name_max_length [X] 0011_update_proxy_permissions [X] 0012_alter_user_first_name_max_length billing [X] 0001_initial contenttypes [X] 0001_initial [X] 0002_remove_content_type_name core [X] 0001_initial [X] 0002_auto_20250330_1155 insurance [X] 0001_initial sessions [X] 0001_initial (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

Your migrations for the billing app have been applied successfully since [X] 0001_initial is marked. ✅

Now, to confirm that the tables exist in the database, run:

Option 1: Check Tables in Django Shell

sh
python manage.py shell

Then, run:

python
from django.db import connection
cursor = connection.cursor()
cursor.execute("PRAGMA table_info(billing_billing);")  # For SQLite
columns = cursor.fetchall()
for column in columns:
    print(column)

If you see the table columns, then your database has the billing_billing table.

Option 2: Query the Database

Try fetching records:

python
from billing.models import Billing
print(Billing.objects.all())  # Should return an empty queryset [] if no records exist

If you get an error like "no such table: billing_billing", your database might not have the expected structure. You may need to reset migrations by:

Delete migration files
```
sh
rm billing/migrations/00*.py
```
Delete database file (if using SQLite)
```
sh
rm db.sqlite3
```

Run migrations again

sh
python manage.py makemigrations
python manage.py migrate

Let me know what results you get. 🚀

Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from django.db import connection >>> cursor = connection.cursor() >>> cursor.execute("PRAGMA table_info(billing_billing);") # For SQLite <django.db.backends.sqlite3.base.SQLiteCursorWrapper object at 0x0000022F07B42C30> >>> columns = cursor.fetchall() >>> for column in columns: ... print(column) ... (0, 'id', 'INTEGER', 1, None, 1) (1, 'part_quantity', 'INTEGER', 1, None, 0) (2, 'total_cost', 'decimal', 0, None, 0) (3, 'payment_method', 'varchar(50)', 1, None, 0) (4, 'payment_amount', 'decimal', 1, None, 0) (5, 'part_id', 'bigint', 1, None, 0) (6, 'service_id', 'bigint', 1, None, 0) (7, 'vehicle_id', 'bigint', 1, None, 0) >>>

Your billing_billing table exists, but it's missing the booking_id field, which should be a foreign key to the Booking model.

It seems like Django didn't fully update the database schema. Here’s how to fix it:

1. Make Sure the Model Has `booking`

Double-check that your Billing model in models.py includes:

python
class Billing(models.Model):
    booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True)
    part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True)
    part_quantity = models.IntegerField(default=1)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

If booking is missing, add it and proceed with the next steps.

2. Generate a New Migration

Run:

sh
python manage.py makemigrations billing

Django should detect a change and create a migration for the missing booking_id field.

3. Apply the Migration

sh
python manage.py migrate billing

This should add the missing field.

4. Verify the Table Again

Run the PRAGMA table_info(billing_billing); query again. If booking_id is now present, your issue is fixed! 🎉

Let me know how it goes. 🚀

The error "billing_billing.booking_id contains a value that does not exist in billing_booking.id" means that Django tried to add the booking_id foreign key, but there are existing records in the billing_billing table with invalid or missing booking_id values.

Steps to Fix This Issue

1. Check If `billing_booking` Table Exists

Run the following inside the Django shell:

python
from django.db import connection
cursor = connection.cursor()
cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='billing_booking';")
print(cursor.fetchone())

If it returns None, then the billing_booking table is missing.

2. Check Data in `billing_billing`

Run:

python
cursor.execute("SELECT * FROM billing_billing;")
rows = cursor.fetchall()
for row in rows:
    print(row)

Check if there are NULL or invalid values in booking_id.

3. Manually Fix the Issue

Option 1: Remove Invalid Data

If there are existing rows with booking_id values that don’t exist in billing_booking, delete them manually in the database shell:

python
cursor.execute("DELETE FROM billing_billing WHERE booking_id NOT IN (SELECT id FROM billing_booking);")
connection.commit()

Then, try running:

sh
python manage.py migrate billing

Option 2: Set `booking_id` to NULL Temporarily

If deleting data is not an option, update the records to have NULL instead:

python
cursor.execute("UPDATE billing_billing SET booking_id=NULL WHERE booking_id NOT IN (SELECT id FROM billing_booking);")
connection.commit()

Then try the migration again.

4. Run Migrations Again

sh
python manage.py migrate billing

5. Check If Everything Works

Run:

sh
python manage.py showmigrations billing

Make sure all migrations have an [X].

After doing this, check if PRAGMA table_info(billing_billing); now shows booking_id correctly. Let me know what happens! 🚀

>>> django.db.utils.IntegrityError: The row in table 'billing_billing' with primary key '1' has an invalid foreign key: billing_billing.booking_id contains a value 'booking_id' that does not have a corresponding value in billing_booking.id. File "<console>", line 1 django.db.utils.IntegrityError: The row in table 'billing_billing' with primary key '1' has an invalid foreign key: billing_billing.booking_id contains a value 'booking_id' that does not have a corresponding value in billing_booking.id. ^^^ SyntaxError: invalid syntax >>> (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

It looks like Django is enforcing foreign key constraints, and the booking_id values in billing_billing do not exist in billing_booking. Let's go step by step to fix it.

Steps to Fix the Foreign Key Integrity Error

1. Check If `billing_booking` Table Exists

Run this in the Django shell:

python
from django.db import connection
cursor = connection.cursor()
cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='billing_booking';")
print(cursor.fetchone())  # Should print ('billing_booking',) if the table exists

If it prints None, the table does not exist, meaning migrations were not applied correctly.

2. Check Existing Data in `billing_billing`

Run:

python
cursor.execute("SELECT * FROM billing_billing;")
rows = cursor.fetchall()
for row in rows:
    print(row)

Check if booking_id has invalid values (e.g., NULL, booking_id, or values that do not exist in billing_booking).

3. Find Missing `booking_id` Values

Run:

python
cursor.execute("SELECT DISTINCT booking_id FROM billing_billing WHERE booking_id NOT IN (SELECT id FROM billing_booking);")
print(cursor.fetchall())  # This will show invalid foreign key values

If this returns values, it means there are booking_id values in billing_billing that do not exist in billing_booking.

4. Fix the Issue

Option 1: Remove Invalid Data

If there are orphaned foreign keys, delete those rows:

python
cursor.execute("DELETE FROM billing_billing WHERE booking_id NOT IN (SELECT id FROM billing_booking);")
connection.commit()

Then try running:

sh
python manage.py migrate billing

Option 2: Set `booking_id` to NULL

If you don’t want to delete, set booking_id to NULL:

python
cursor.execute("UPDATE billing_billing SET booking_id=NULL WHERE booking_id NOT IN (SELECT id FROM billing_booking);")
connection.commit()

5. Try Migrations Again

sh
python manage.py migrate billing

Then check if everything is applied:

sh
python manage.py showmigrations billing

6. Confirm Fix

Run:

python
cursor.execute("PRAGMA foreign_key_check;")
print(cursor.fetchall())  # Should return an empty list if there are no FK issues

If the list is empty, the foreign key issue is resolved.

Let Me Know What Happens! 🚀

If the problem persists, share the output of:

sh
python manage.py showmigrations

and

python
cursor.execute("SELECT * FROM billing_billing;")
print(cursor.fetchall())

^^^ IndentationError: unexpected indent >>> SyntaxError: invalid syntax File "<console>", line 1 SyntaxError: invalid syntax ^^^^^^ SyntaxError: invalid syntax >>> >>> (venv) PS C:\Users\lau\Desktop\Projects\garage_system>from django.db import connection File "<console>", line 1 >>> (venv) PS C:\Users\lau\Desktop\Projects\garage_system>from django.db import connection ^^ SyntaxError: invalid syntax >>> cursor = connection.cursor() Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'connection' is not defined >>> cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='billing_booking';") Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'cursor' is not defined >>> print(cursor.fetchone()) # Should print ('billing_booking',) if the table exists Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'cursor' is not defined >>>

You're getting NameError because the connection and cursor objects are not defined. You need to start the Django shell before running database queries.

1. Open Django Shell

In your terminal, run:

sh
python manage.py shell

2. Check If `billing_booking` Table Exists

Once inside the shell, run:

python
from django.db import connection

cursor = connection.cursor()
cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='billing_booking';")
print(cursor.fetchone())  # Should print ('billing_booking',) if the table exists

If it prints None, that means the billing_booking table does not exist.

3. If the Table Exists, Check for Missing Foreign Keys

Run:

python
cursor.execute("SELECT DISTINCT booking_id FROM billing_billing WHERE booking_id NOT IN (SELECT id FROM billing_booking);")
print(cursor.fetchall())  # This will show invalid foreign key values

If it returns values, those are booking_ids that do not exist in billing_booking.

4. Fix Missing Foreign Keys

Option 1: Delete Orphaned Data

python
cursor.execute("DELETE FROM billing_billing WHERE booking_id NOT IN (SELECT id FROM billing_booking);")
connection.commit()

Option 2: Set `booking_id` to NULL

python
cursor.execute("UPDATE billing_billing SET booking_id=NULL WHERE booking_id NOT IN (SELECT id FROM billing_booking);")
connection.commit()

5. Reapply Migrations

Exit the Django shell (Ctrl + D or type exit()) and run:

sh
python manage.py migrate billing

6. Confirm Fix

Reopen the Django shell and run:

python
cursor.execute("PRAGMA foreign_key_check;")
print(cursor.fetchall())  # Should return an empty list if everything is fixed

Try these steps and let me know what happens! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell >> Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from django.db import connection >>> >>> cursor = connection.cursor() >>> cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='billing_booking';") <django.db.backends.sqlite3.base.SQLiteCursorWrapper object at 0x0000018A933A2C30> >>> print(cursor.fetchone()) # Should print ('billing_booking',) if the table exists None >>>

The result None means that the billing_booking table does not exist in your database, which is why you're getting foreign key errors in billing_billing.

How to Fix It

Since the table is missing, you need to recreate the database schema properly.

1. Delete the Old Database File (Only for SQLite)

Since you're using SQLite, delete the old database file (db.sqlite3):

sh
rm db.sqlite3

If you're using Windows PowerShell, run:

sh
del db.sqlite3

2. Delete Old Migrations

sh
rm -rf billing/migrations/__pycache__
rm billing/migrations/00*.py

(Use del instead of rm if on Windows PowerShell.)

3. Recreate the Database & Apply Migrations

Run the following commands:

sh
python manage.py migrate
python manage.py makemigrations billing
python manage.py migrate billing

4. Confirm the Fix

Reopen the Django shell:

sh
python manage.py shell

Then run:

python
from django.db import connection

cursor = connection.cursor()
cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='billing_booking';")
print(cursor.fetchone())  # Should print ('billing_booking',) if the table exists

If billing_booking appears, the issue is resolved! 🎉
Let me know how it goes. 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> rm db.sqlite3 rm : Cannot remove item C:\Users\lau\Desktop\Projects\garage_system\db.sqlite3: The process cannot access the file 'C:\Users\lau\Desktop\Projects\garage_system\db.sqlite3' because it is being used by another process. At line:1 char:1 + rm db.sqlite3 + ~~~~~~~~~~~~~ + CategoryInfo : WriteError: (C:\Users\lau\De...stem\db.sqlite3:FileInfo) [Remove-Item], IOException + FullyQualifiedErrorId : RemoveFileSystemItemIOError,Microsoft.PowerShell.Commands.RemoveItemCommand (venv) PS C:\Users\lau\Desktop\Projects\garage_system> del db.sqlite3 del : Cannot remove item C:\Users\lau\Desktop\Projects\garage_system\db.sqlite3: The process cannot access the file 'C:\Users\lau\Desktop\Projects\garage_system\db.sqlite3' because it is being used by another process. At line:1 char:1 + del db.sqlite3 + ~~~~~~~~~~~~~~ + CategoryInfo : WriteError: (C:\Users\lau\De...stem\db.sqlite3:FileInfo) [Remove-Item], IOException + FullyQualifiedErrorId : RemoveFileSystemItemIOError,Microsoft.PowerShell.Commands.RemoveItemCommand (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

The error means that db.sqlite3 is currently in use by another process, most likely your Django development server or another open connection.

How to Fix It

Follow these steps to safely delete the database file:

1. Close Running Processes

If the Django development server is running, stop it by pressing:
```
mathematica
Ctrl + C
```
Close any other terminals or processes using the database.

2. Use PowerShell to Force Delete

Run this command in PowerShell:

sh
Stop-Process -Name "python" -Force

This will terminate all Python processes, ensuring nothing is locking db.sqlite3.

3. Delete the Database

Now, try deleting it again:

sh
del db.sqlite3

If that still doesn’t work, restart your computer and try deleting the file again.

Let me know if you need more help! 🚀

In Windows PowerShell, use Remove-Item or del instead of rm. Here’s how you can delete all migration files starting with 00 inside the billing/migrations/ folder:

Using PowerShell

powershell
del billing/migrations/00*.py

powershell
Remove-Item billing/migrations/00*.py

If you want to delete all migration files (except __init__.py), use:

powershell
del billing/migrations/*.py -Exclude __init__.py

Force Delete (If Necessary)

If you get permission issues, try:

powershell
del billing/migrations/00*.py -Force

powershell
Remove-Item billing/migrations/00*.py -Force

Let me know if you need more help! 🚀

Looks like the command executed without errors. You can verify if the migration files are deleted by running:

powershell
ls billing/migrations

powershell
Get-ChildItem billing/migrations

If the migration files are gone (except __init__.py), you can proceed with re-creating the migrations:

powershell
python manage.py makemigrations billing
python manage.py migrate

Let me know if you hit any issues! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> del billing/migrations/00*.py (venv) PS C:\Users\lau\Desktop\Projects\garage_system> Remove-Item billing/migrations/00*.py (venv) PS C:\Users\lau\Desktop\Projects\garage_system> ls billing/migrations Directory: C:\Users\lau\Desktop\Projects\garage_system\billing\migrations Mode LastWriteTime Length Name ---- ------------- ------ ---- d----- 3/31/2025 1:32 PM __pycache__ -a---- 3/30/2025 6:25 PM 0 __init__.py (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

Looks good! The old migrations are deleted, and only __init__.py remains, which is required.

Now, you can re-create the migrations and apply them again:

powershell
python manage.py makemigrations billing
python manage.py migrate

If you still have issues with the database, you might need to delete and recreate it:

Make sure the database is not in use (close any running shell or runserver sessions).
Try deleting it again:
```
powershell
del db.sqlite3
```

Then run:

powershell
python manage.py migrate

This will create a fresh database. Let me know how it goes! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> del db.sqlite3 del : Cannot remove item C:\Users\lau\Desktop\Projects\garage_system\db.sqlite3: The process cannot access the file 'C:\Users\lau\Desktop\Projects\garage_system\db.sqlite3' because it is being used by another process. At line:1 char:1 + del db.sqlite3 + ~~~~~~~~~~~~~~ + CategoryInfo : WriteError: (C:\Users\lau\De...stem\db.sqlite3:FileInfo) [Remove-Item], IOException + FullyQualifiedErrorId : RemoveFileSystemItemIOError,Microsoft.PowerShell.Commands.RemoveItemCommand (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

The error means that db.sqlite3 is being used by another process. Try these steps to unlock and delete it:

1️⃣ Close Running Processes

Close the Django shell (exit() if open).
Stop the Django server if running (Ctrl + C in the terminal).
Restart your terminal (close and reopen PowerShell).

2️⃣ Check for Locked Files

Run the following command to check if db.sqlite3 is in use:

powershell
Get-Process | Where-Object { $_.MainWindowTitle -like "*sqlite*" }

If a process is found, note its ID and terminate it using:

powershell
Stop-Process -Id <PROCESS_ID> -Force

3️⃣ Delete the Database

Try deleting it again:
```
powershell
del db.sqlite3
```

Let me know if it still doesn’t work! 🚀

It looks like Django still thinks some tables exist even though you deleted the database. Try these steps to completely reset your migrations and database:

1️⃣ Ensure the Database is Deleted

Since Windows sometimes locks files, try these steps to delete db.sqlite3:

Close Any Running Django Processes

If you have the Django development server running, stop it by pressing CTRL + C in the terminal.
Close any Python processes that might be using the database.

Manually Delete the Database

If del db.sqlite3 didn't work, try:

powershell
Remove-Item -Path db.sqlite3 -Force

Or delete it manually from File Explorer.

2️⃣ Clear Migrations

After deleting db.sqlite3, remove migration files:

powershell
Remove-Item billing/migrations/00*.py -Force
Remove-Item core/migrations/00*.py -Force
Remove-Item insurance/migrations/00*.py -Force

Make sure only __init__.py remains in each migrations folder.

3️⃣ Recreate the Database & Migrate

Run:

powershell
python manage.py makemigrations
python manage.py migrate

4️⃣ Create a Superuser (If Needed)

powershell
python manage.py createsuperuser

5️⃣ Run the Server

powershell
python manage.py runserver

Let me know if you hit any errors! 🚀

The error "table 'core_service' already exists" suggests that your database schema is out of sync with your migrations. Since you've already deleted and recreated migrations, but the database still has old tables, follow these steps to fix it:

Fixing the Issue Step by Step

1. Delete the database file (if using SQLite)

Since you've already attempted this but got a "file in use" error, ensure you:

Stop the server:
Press CTRL + C in the terminal where Django is running.
Then, delete the database file:
```
powershell
del db.sqlite3
```
(If it still says "file in use," restart your system and try again.)

2. Remove old migrations

After deleting the database, remove old migration files (except __init__.py):

powershell
del core/migrations/00*.py
del billing/migrations/00*.py
del insurance/migrations/00*.py
del sessions/migrations/00*.py

3. Recreate migrations

Now, generate fresh migrations:

powershell
python manage.py makemigrations

4. Apply migrations

Run:

powershell
python manage.py migrate

5. Start the server

Now, start the Django development server again:

powershell
python manage.py runserver

This should fix the issue. Let me know if you face any problems! 🚀

Migrations for 'core': core\migrations\0001_initial.py + Create model Service + Create model Booking Migrations for 'insurance': insurance\migrations\0001_initial.py + Create model InsurancePolicy + Create model Vehicle + Create model InsuranceClaim + Add field vehicle to insurancepolicy Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: Applying contenttypes.0001_initial... OK Applying contenttypes.0002_remove_content_type_name... OK Applying auth.0001_initial... OK Applying auth.0002_alter_permission_name_max_length... OK Applying auth.0003_alter_user_email_max_length... OK Applying auth.0004_alter_user_username_opts... OK Applying auth.0005_alter_user_last_login_null... OK Applying auth.0006_require_contenttypes_0002... OK Applying auth.0007_alter_validators_add_error_messages... OK Applying auth.0008_alter_user_username_max_length... OK Applying auth.0009_alter_user_last_name_max_length... OK Applying auth.0010_alter_group_name_max_length... OK Applying auth.0011_update_proxy_permissions... OK Applying auth.0012_alter_user_first_name_max_length... OK Applying accounts.0001_initial... OK Applying admin.0001_initial... OK Applying admin.0002_logentry_remove_auto_add... OK Applying admin.0003_logentry_add_action_flag_choices... OK Applying billing.0001_initial... OK Applying core.0001_initial... OK Applying insurance.0001_initial... OK Applying sessions.0001_initial... OK (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py runserver Watching for file changes with StatReloader Performing system checks... System check identified no issues (0 silenced). March 31, 2025 - 13:43:48 Django version 5.1.7, using settings 'garage.settings' Starting development server at http://127.0.0.1:8000/ Quit the server with CTRL-BREAK. Not Found: /billing/create_billing/7/ [31/Mar/2025 13:44:18] "GET /billing/create_billing/7/ HTTP/1.1" 404 7477 Not Found: /billing/create_billing/7/ [31/Mar/2025 13:44:20] "GET /billing/create_billing/7/ HTTP/1.1" 404 7477 Not Found: /billing/create_vehicle/7/ [31/Mar/2025 13:44:22] "GET /billing/create_vehicle/7/ HTTP/1.1" 404 7176 Internal Server Error: /billing/create_customer/ Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py", line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py", line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\billing\views.py", line 16, in create_customer customer, created = Customer.objects.get_or_create(user=user, defaults={"name": user.username, "email": user.email}) ^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\utils\functional.py", line 253, in inner return func(_wrapped, *args) ^^^^^^^^^^^^^^^^^^^^^ AttributeError: 'AnonymousUser' object has no attribute 'email' [31/Mar/2025 13:44:23] "GET /billing/create_customer/ HTTP/1.1" 500 72986

The error you're encountering is related to the AnonymousUser object not having the email attribute. This happens because you're trying to access user.email for an anonymous user (a user who is not logged in).

Here's how you can handle this:

Solution:

In your create_customer view (in views.py), you need to ensure that the user is authenticated before trying to access their email. You can use the request.user.is_authenticated check to make sure the user is logged in.

Example code:

python
from django.shortcuts import render
from django.contrib.auth.models import User
from .models import Customer

def create_customer(request):
    # Check if the user is authenticated
    if request.user.is_authenticated:
        user = request.user
        customer, created = Customer.objects.get_or_create(
            user=user,
            defaults={"name": user.username, "email": user.email}  # Only access email if user is authenticated
        )
    else:
        # Handle anonymous user (maybe redirect to login page or return a response indicating the issue)
        return redirect('login')  # Adjust this based on your login URL name
    
    # Continue with your logic after the user has been verified
    return render(request, 'customer_creation_page.html', {'customer': customer})

Explanation:

request.user.is_authenticated: This checks whether the user is logged in. If True, you can safely access attributes like email and username.
Handle anonymous users: You can either redirect them to the login page or show an appropriate error message.

Next Steps:

Modify your create_customer view based on the example above.
Test again by trying to access the create_customer page while logged in and logged out to ensure the behavior works as expected.

Let me know how it goes!

To create a superuser in Django, you can run the following command in your terminal:

bash
python manage.py createsuperuser

When you run this command, Django will prompt you for a few details to create the superuser, such as:

Username
Email address
Password (and confirmation)

Make sure to remember the username and password, as you'll use them to log in to the Django admin interface.

Once the superuser is created successfully, you can log in to the Django admin at:

arduino
http://127.0.0.1:8000/admin/

Let me know if you encounter any issues!

AttributeError at /billing/create_billing/1/ 'Vehicle' object has no attribute 'booked_service' Request Method: GET Request URL: http://127.0.0.1:8000/billing/create_billing/1/ Django Version: 5.1.7 Exception Type: AttributeError Exception Value: 'Vehicle' object has no attribute 'booked_service' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 47, in create_billing Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 10:48:58 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 47, in create_billing booked_service = vehicle.booked_service def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Fetch the booked service for the vehicle (assuming vehicle has a booked_service field) booked_service = vehicle.booked_service # Get all optional parts parts = Part.objects.all() if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None # Calculate total cost total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) # Create billing record billing = Billing.objects.create( vehicle=vehicle, service=booked_service, part=selected_part, total_cost=total_cost ) return redirect("generate_invoice", billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts })

The error AttributeError: 'Vehicle' object has no attribute 'booked_service' indicates that the Vehicle model does not have an attribute named booked_service. This can happen if the Vehicle model doesn't have the field booked_service or if the relationship is different than expected.

To resolve this:

1. Verify `booked_service` Field in `Vehicle` Model

Check the Vehicle model to ensure that the booked_service field exists, and confirm whether it's a ForeignKey, ManyToManyField, or some other field type.

For example, if the booked_service is meant to be a foreign key to the Service model, it should look something like this:

python
class Vehicle(models.Model):
    # Other fields...
    booked_service = models.ForeignKey(Service, on_delete=models.SET_NULL, null=True, blank=True)

Make sure that booked_service exists in your model and that it’s properly migrated.

2. Check for Existing Migrations

If you've added the booked_service field to the model after creating migrations, make sure you've run the migrations to apply the changes.

bash
python manage.py makemigrations
python manage.py migrate

3. Modify the Code to Handle Missing Field

If booked_service isn't intended to be a field on Vehicle, but instead you were expecting it to be derived from a relationship or a different source, you may need to adjust the logic in your view.

For example, if the booked_service is related to the Booking model (and Booking is linked to Vehicle), your view might need to look up the service through the Booking model instead of directly from Vehicle:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the booked service via the Booking model (assuming vehicle has a booking)
    booking = vehicle.booking_set.first()  # Adjust as necessary for your relationships
    booked_service = booking.service if booking else None

    if booked_service is None:
        # Handle the case where there is no booked service
        return render(request, "billing/error.html", {"message": "No booked service found for this vehicle."})

    # Get all optional parts
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record
        billing = Billing.objects.create(
            vehicle=vehicle,
            service=booked_service,
            part=selected_part,
            total_cost=total_cost
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Make sure the relationship between Vehicle, Booking, and Service is properly defined and adjust the view code to reflect the correct logic.

Let me know if you need further clarification!

Great! Now that we have a clearer view of the models, let's continue with the functionality we were working on earlier — specifically the billing process in the create_billing view.

Key Things to Check and Implement:

Fetching the correct service for the vehicle: Based on the Booking model, we need to ensure that the Service is fetched through the related Booking for the Vehicle.
Handling the Billing creation: When creating a Billing record, we'll ensure that the cost calculations are correct based on the Service and any optional parts selected.

Here’s the continuation and update of the create_billing view to handle the billing logic, incorporating the Booking model for getting the service details:

Updated `create_billing` View:

python
from django.shortcuts import render, get_object_or_404, redirect
from .models import Vehicle, Part, Booking, Billing

def create_billing(request, vehicle_id):
    # Fetch the vehicle using the provided vehicle_id
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the latest booked service for the vehicle (assuming the vehicle can have multiple bookings)
    booking = vehicle.booking_set.first()  # Or adjust to get the latest or relevant booking
    if not booking:
        # Handle the case where no booking exists for the vehicle
        return render(request, "billing/error.html", {"message": "No service booked for this vehicle."})

    booked_service = booking.service

    # Get all optional parts
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost based on booked service and any selected part
        total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0)

        # Create a Billing record with the calculated total cost
        billing = Billing.objects.create(
            booking=booking,
            part=selected_part,
            part_quantity=int(request.POST.get("quantity", 1)),
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to the invoice generation page (adjust to your URL name)
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Explanation of Changes:

Fetching the Booked Service:
- The view now fetches the Booking for the given vehicle and retrieves the associated Service from that booking (vehicle.booking_set.first()).
- Adjust the .first() if you want to handle multiple bookings or fetch the most recent one based on created_at.
Handling Parts and Calculating Total Cost:
- The total cost is calculated based on the Service cost from the Booking and the selected part (if any). The quantity of the part is also considered.
Saving the Billing Record:
- The Billing record is created with the correct total_cost, using the calculate_total method, ensuring the cost is updated.
Redirecting to the Invoice Generation:
- After saving the Billing, the user is redirected to generate an invoice (replace generate_invoice with your actual URL name for invoice generation).

Adjustments to the Template:

In your create_billing.html template, you will need to handle the part selection and quantity, for example:

html
<form method="POST">
    {% csrf_token %}
    <label for="part">Select Part:</label>
    <select name="part" id="part">
        {% for part in parts %}
            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
        {% endfor %}
    </select>

    <label for="quantity">Quantity:</label>
    <input type="number" name="quantity" id="quantity" value="1" min="1">

    <label for="payment_method">Payment Method:</label>
    <input type="text" name="payment_method" id="payment_method">

    <label for="payment_amount">Payment Amount:</label>
    <input type="number" name="payment_amount" id="payment_amount" step="0.01" required>

    <button type="submit">Create Billing</button>
</form>

Make sure to adjust the template based on your UI and other requirements.

Next Steps:

Check the related URL patterns: Ensure that the URL for create_billing and generate_invoice is correctly set in your urls.py file.
Migrate and Test: After making these changes, run your migrations again to ensure everything is applied correctly, and then test the billing creation.

Let me know if you need further help!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } label { font-size: 16px; color: #333; } .info { background: #f0f0f0; padding: 10px; border-radius: 5px; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <div class="info"> <p><strong>Service:</strong> {{ booked_service.name }}</p> <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p> </div> <form method="post"> {% csrf_token %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part"> <option value="" selected>Select a Part</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> {% endif %} <button type="submit">Proceed to Invoice</button> </form> </div> </body> </html> here adjust to match the view

To adjust the template to match the create_billing view, we need to include the fields for selecting parts, specifying the quantity, and adding payment information (such as payment_method and payment_amount). Also, we'll handle form submission appropriately.

Here’s the adjusted template based on the updated create_billing view:

Updated Template:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        .info {
            background: #f0f0f0;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            padding: 12px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <br><br>

        <label for="quantity">Quantity (if applicable):</label>
        <input type="number" name="quantity" id="quantity" value="1" min="1" step="1">
        <br><br>
        {% endif %}

        <label for="payment_method">Payment Method:</label>
        <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash">
        <br><br>

        <label for="payment_amount">Payment Amount (KSH):</label>
        <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount">
        <br><br>

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>

</body>
</html>

Key Adjustments:

Quantity Field:
- Added an input field for quantity, which will be used to multiply the part's cost if selected.
Payment Method and Amount:
- Added input fields for payment_method and payment_amount as required by the Billing model.
Parts Dropdown:
- If there are parts available, a dropdown menu allows users to select a part. The optional parts are looped and listed with their names and costs.
Form Submission:
- The form submits all the required data (part selection, quantity, payment method, and payment amount) to create a billing record.

Next Steps:

Validation: You might want to add validation on the backend to ensure the data is consistent (e.g., checking that the payment amount matches the total cost).
Invoice Generation: If the user successfully creates a billing record, you should redirect them to an invoice page where they can view the details and make a payment.

Let me know if you need further adjustments!

You're right, we should be taking the details from the Booking model as mentioned in the create_billing view. The booked_service is derived from the Booking object, and the parts and quantities are linked to that service for billing purposes.

Here’s the corrected approach for the template:

Service: We'll get the service associated with the booking.
Parts: We'll fetch optional parts that are available.
Billing Information: We'll gather the required billing information (quantity, payment method, payment amount).

Updated Template (Using Booking Information):

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        .info {
            background: #f0f0f0;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            padding: 12px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <br><br>

        <label for="quantity">Quantity (if applicable):</label>
        <input type="number" name="quantity" id="quantity" value="1" min="1" step="1">
        <br><br>
        {% endif %}

        <label for="payment_method">Payment Method:</label>
        <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash">
        <br><br>

        <label for="payment_amount">Payment Amount (KSH):</label>
        <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount">
        <br><br>

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>

</body>
</html>

Key Adjustments:

Booked Service:
- The booked_service now refers to the service selected in the booking, and its details (name and cost) are displayed in the template.
Parts and Quantities:
- The optional parts are still shown if there are any available. The user can choose a part and enter its quantity.
Billing Information:
- After selecting the part and quantity, the user can proceed to enter the payment details (payment method and amount).
Post Submission:
- When the form is submitted, the payment amount is sent to the backend along with any selected part information to calculate the total cost.

Let me know if this aligns better with the structure of your models and view!

TemplateDoesNotExist at /billing/create_billing/3/ billing/error.html Request Method: GET Request URL: http://127.0.0.1:8000/billing/create_billing/3/ Django Version: 5.1.7 Exception Type: TemplateDoesNotExist Exception Value: billing/error.html Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\loader.py, line 19, in get_template Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 10:54:21 +0000

The error you're encountering suggests that Django is trying to render a template called billing/error.html, but it cannot find it in the expected location.

This might happen if your view is set up to handle an error or exception (perhaps when there's an issue with the data or something goes wrong), but the error.html template is missing from your billing app's template directory.

Here's how to fix it:

Create error.html: If you want to display a custom error page, create a template named error.html in the billing app’s templates folder.

For example:
```
go
garage_system/
└── billing/
    └── templates/
        └── billing/
            └── error.html
```

Example content for error.html: You can create a simple error page like this:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Error</title>
</head>
<body>
    <h1>Something went wrong!</h1>
    <p>We couldn't process your request at this moment. Please try again later.</p>
</body>
</html>

Ensure Template Directory is Set: Make sure that Django is aware of your app's templates by including the following setting in your settings.py:

python
TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [
            BASE_DIR / 'templates',
        ],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

This ensures that Django will look for templates within each app's templates folder.

Debugging: If you don't intend to handle the error with a custom template, you might need to revisit the view or middleware where this is being triggered. It could be an exception that’s being raised, causing Django to try and render an error page.

Let me know if you need further assistance!

def create_billing(request, vehicle_id): # Fetch the vehicle using the provided vehicle_id vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Fetch the latest booked service for the vehicle (assuming the vehicle can have multiple bookings) booking = vehicle.booking_set.first() # Or adjust to get the latest or relevant booking if not booking: # Handle the case where no booking exists for the vehicle return render(request, "billing/error.html", {"message": "No service booked for this vehicle."}) booked_service = booking.service # Get all optional parts parts = Part.objects.all() if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None # Calculate total cost based on booked service and any selected part total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0) # Create a Billing record with the calculated total cost billing = Billing.objects.create( booking=booking, part=selected_part, part_quantity=int(request.POST.get("quantity", 1)), total_cost=total_cost, payment_method=request.POST.get("payment_method"), payment_amount=request.POST.get("payment_amount"), ) # Redirect to the invoice generation page (adjust to your URL name) return redirect("generate_invoice", billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts }) cant we redirect somewhere else more appropriate

Yes, if you prefer to redirect to a more appropriate page after creating the billing, you can redirect to a more relevant view based on your application structure. Here are a few options, depending on what you're trying to achieve:

Option 1: Redirect to the Vehicle's Detail Page

If you want the user to see more details about the vehicle after creating the billing, you can redirect to the vehicle’s detail page or a similar page that displays the vehicle's information.

For example:

python
return redirect("vehicle_detail", vehicle_id=vehicle.id)

In this case, you'll need to have a URL pattern and a corresponding view for the vehicle_detail page.

Option 2: Redirect to the List of All Vehicles for the Customer

If you'd prefer the user to be redirected to a page listing all the vehicles under the current customer, you can redirect to a view that lists vehicles.

For example:

python
return redirect("customer_vehicles", customer_id=vehicle.customer.id)

Again, this assumes you have a URL pattern and a view for the list of vehicles.

Option 3: Redirect to the Billing List or History Page

If your application has a page that lists all billing records, you can redirect to that page so the user can see the newly created billing in the context of all their billing records.

For example:

python
return redirect("billing_history", customer_id=vehicle.customer.id)

This assumes you have a view that lists the billing history for the customer.

Option 4: Redirect to an Invoice Generation Page

If you want the user to see the generated invoice directly, you could keep the redirect to the generate_invoice page but ensure that it's part of the process and fits logically in the flow.

Example:

python
return redirect("generate_invoice", billing_id=billing.id)

This will ensure they see the invoice for the specific billing record that was just created.

Final Example with Redirection:

Here's a modified version of your view with an example of redirecting to a vehicle detail page:

python
from django.shortcuts import redirect, render, get_object_or_404
from .models import Vehicle, Booking, Part, Billing

def create_billing(request, vehicle_id):
    # Fetch the vehicle using the provided vehicle_id
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the latest booked service for the vehicle (assuming the vehicle can have multiple bookings)
    booking = vehicle.booking_set.first()  # Or adjust to get the latest or relevant booking
    if not booking:
        # Handle the case where no booking exists for the vehicle
        return render(request, "billing/error.html", {"message": "No service booked for this vehicle."})

    booked_service = booking.service

    # Get all optional parts
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost based on booked service and any selected part
        total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0)

        # Create a Billing record with the calculated total cost
        billing = Billing.objects.create(
            booking=booking,
            part=selected_part,
            part_quantity=int(request.POST.get("quantity", 1)),
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to the vehicle detail page after billing creation
        return redirect("vehicle_detail", vehicle_id=vehicle.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

This example redirects the user to a vehicle_detail page after the billing is created. You can adjust the redirect logic based on the appropriate flow of your application.

Let me know if you need more help!

To assign a mechanic to a specific group in Django's admin interface, you'll need to use Django's built-in Group model and assign the mechanic (user) to that group. Here's how you can do it step-by-step:

1. Define a Group for Mechanic in Django Admin

First, you need to make sure that you have a group for mechanics. You can either create this group manually through the Django admin interface or automatically define it using Django models.

Option 1: Create a Group Manually via Admin

Go to the Django Admin page (usually at http://127.0.0.1:8000/admin).
Log in as a superuser.
In the "Authentication and Authorization" section, you should see a "Groups" section.
Click on the "Groups" link, and then click "Add Group".
Create a group called "Mechanic" (or whatever name you prefer).

Option 2: Automatically Create the Group in Code

If you want to create the "Mechanic" group programmatically, you can do so in one of your app's apps.py files (or in a migration file). Here’s an example of how to create it in the ready() method of your app:

python
from django.apps import AppConfig
from django.contrib.auth.models import Group

class YourAppConfig(AppConfig):
    name = 'your_app'

    def ready(self):
        # Create the 'Mechanic' group if it doesn't exist
        Group.objects.get_or_create(name='Mechanic')

2. Assign Mechanic to the Group

Once the group is created, you can assign users (mechanics) to that group. Here’s how you can do that from the Django admin interface or programmatically.

Option 1: Assign a Mechanic to the Group via Admin

In the Django Admin interface, go to the "Users" section under "Authentication and Authorization".
Select the mechanic (user) you want to assign to the "Mechanic" group.
In the user's detail page, scroll down to the "Groups" section.
Add the "Mechanic" group to the user.

Option 2: Assign a Mechanic to the Group Programmatically

If you want to assign a user to the "Mechanic" group programmatically, you can do this:

python
from django.contrib.auth.models import User, Group

# Get the mechanic (user) you want to assign
mechanic = User.objects.get(username='mechanic_username')  # Replace with the actual username

# Get the "Mechanic" group
mechanic_group = Group.objects.get(name='Mechanic')

# Add the user to the "Mechanic" group
mechanic.groups.add(mechanic_group)

3. Ensure Correct Permissions

To make sure that mechanics have the appropriate permissions (such as only viewing specific models or performing specific actions), you can either:

Set permissions for the "Mechanic" group manually in the Django admin interface, or
Define permissions for the group in your models.py or via custom admin classes.

For example, you can assign specific permissions (like adding, changing, or deleting objects) to the "Mechanic" group.

Example for Custom Permissions:

In your models.py, you can define a model with custom permissions for mechanics:

python
class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    class Meta:
        permissions = [
            ("can_manage_services", "Can manage services"),
        ]

Once you've assigned the mechanic to the "Mechanic" group, you can assign these permissions in the admin interface under "Groups" by selecting the "Mechanic" group and then adding the permissions.

4. Using Permissions in Views

If you want to restrict access to certain views or actions based on the group membership (e.g., only allow mechanics to perform certain actions), you can check for the user's group in the view.

Example:

python
from django.contrib.auth.decorators import login_required, user_passes_test

def is_mechanic(user):
    return user.groups.filter(name='Mechanic').exists()

@login_required
@user_passes_test(is_mechanic)
def mechanic_dashboard(request):
    # Your mechanic dashboard logic here
    return render(request, "mechanic_dashboard.html")

Conclusion

You can assign mechanics to the "Mechanic" group either manually through the admin interface or programmatically. Once assigned, you can customize the permissions and access based on the group to restrict and manage what mechanics can and cannot do in your application.

Let me know if you need further clarification or help with any step!

Thanks for the clarification! It sounds like you have the User model under the accounts app, and you're trying to assign users to groups under the "Authentication and Authorization" section.

Let’s go over how to assign a mechanic (or any user) to a group in this case. We’ll handle it both in the Django admin interface and programmatically, considering your setup.

Step 1: Create the "Mechanic" Group in the Django Admin

Go to the Admin Panel: Navigate to the Django admin panel (typically at http://127.0.0.1:8000/admin).
Find Groups: In the admin interface, look under the "Authentication and Authorization" section for the Groups model.
Create the Group: If the "Mechanic" group does not exist yet, click on "Add Group" and create a new group named Mechanic.

Step 2: Assign Users to the "Mechanic" Group in the Admin Interface

Now, let’s assign users (mechanics) to this group:

Go to Users: Under the "Authentication and Authorization" section in the Django Admin, click on Users.
Select the User: Find the user (mechanic) you want to assign to the "Mechanic" group and click on their name.
Assign to Group: Scroll to the Groups field in the user's detail page.
- Select the Mechanic group from the list of available groups.
- Save the user.

Step 3: Assign Users to the "Mechanic" Group Programmatically

If you want to assign users to the "Mechanic" group programmatically (perhaps from within a view or a script), you can use the following approach.

Example to Add a User to the Mechanic Group Programmatically:

python
from django.contrib.auth.models import User, Group

# Get the user (mechanic) you want to assign
mechanic = User.objects.get(username='mechanic_username')  # Replace with the actual username

# Get the "Mechanic" group
mechanic_group = Group.objects.get(name='Mechanic')

# Add the user to the "Mechanic" group
mechanic.groups.add(mechanic_group)

Step 4: Use Groups to Control Access

Once users are assigned to the "Mechanic" group, you may want to restrict certain views or actions only to users in the "Mechanic" group. Here's an example of how to ensure that only mechanics can access a certain view:

Example to Restrict Views to Mechanics:

python
from django.contrib.auth.decorators import login_required, user_passes_test

def is_mechanic(user):
    return user.groups.filter(name='Mechanic').exists()

@login_required
@user_passes_test(is_mechanic)
def mechanic_dashboard(request):
    # Your mechanic dashboard logic here
    return render(request, "mechanic_dashboard.html")

In the above code:

is_mechanic checks if the user is part of the "Mechanic" group.
@user_passes_test(is_mechanic) ensures that only users in the "Mechanic" group can access the mechanic_dashboard view.

Step 5: Set Permissions (Optional)

If you need to assign specific permissions to the "Mechanic" group, you can do this under the Groups section in the admin interface.

For example, you can create custom permissions in your models (if needed) and assign them to the group:

Example of Creating Custom Permissions:

In models.py, you can define permissions like this:

python
class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    class Meta:
        permissions = [
            ("can_manage_services", "Can manage services"),
        ]

Then, go to the Groups section in the Django Admin and assign the "can_manage_services" permission to the "Mechanic" group.

Conclusion

To summarize:

Create the "Mechanic" Group via the Groups section under "Authentication and Authorization" in the Django Admin.
Assign Users (Mechanics) to the Group through the "Users" section in the admin interface or programmatically.
Control Access by checking if the user is in the "Mechanic" group, either in views or via permissions.

Let me know if you need more help with any of these steps!

def create_vehicle(request, customer_id): customer = get_object_or_404(Customer, id=customer_id) # Get customer safely if request.method == 'POST': form = VehicleForm(request.POST) if form.is_valid(): vehicle = form.save(commit=False) vehicle.customer = customer # Link vehicle to the customer vehicle.save() return redirect('create_billing', vehicle_id=vehicle.id) else: form = VehicleForm() return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer}) def create_billing(request, vehicle_id): # Fetch the vehicle using the provided vehicle_id vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Fetch the latest booked service for the vehicle (assuming the vehicle can have multiple bookings) booking = vehicle.booking_set.first() # Or adjust to get the latest or relevant booking if not booking: # Handle the case where no booking exists for the vehicle return render(request, "billing/home.html", {"message": "No service booked for this vehicle."}) booked_service = booking.service # Get all optional parts parts = Part.objects.all() if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None # Calculate total cost based on booked service and any selected part total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0) # Create a Billing record with the calculated total cost billing = Billing.objects.create( booking=booking, part=selected_part, part_quantity=int(request.POST.get("quantity", 1)), total_cost=total_cost, payment_method=request.POST.get("payment_method"), payment_amount=request.POST.get("payment_amount"), ) # Redirect to the invoice generation page (adjust to your URL name) return redirect("generate_invoice", billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts }) after creating vehicle next was to take the booking info for billing or?

Yes, after creating the vehicle, the next logical step would be to take the booking information for billing, as you've outlined in the flow.

Here’s the process broken down:

Create the Vehicle: This is where the user provides the vehicle details, and it’s associated with a specific customer.
Create the Booking (if it hasn’t been done yet): When the vehicle is created, it should be linked to a booked service (assuming the service is related to that vehicle).
- If there’s no booking yet, you should prompt the user to book a service for that vehicle.
- If there’s an existing booking, you can proceed directly to the billing process.
Create Billing: After confirming that the vehicle has a booking, the billing process can proceed where the user selects parts (if any) and payment details.

Adjustments to Your Workflow

Let’s adjust the flow to ensure it handles this correctly:

Check for an Existing Booking:
- If a booking exists for the vehicle, proceed to the billing step.
- If no booking exists, redirect the user to a booking page to create one.
Creating the Booking:
- This can be done in a separate view if not already done in the previous steps.

Here's a potential adjustment to the `create_billing` view:

Updated `create_billing` view:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)  # Fetch the vehicle using the vehicle_id
    
    # Fetch the latest booked service for the vehicle (or redirect if none exists)
    booking = vehicle.booking_set.first()  # Adjust to get the latest or relevant booking
    
    if not booking:
        # Handle the case where no booking exists for the vehicle
        return redirect('create_booking', vehicle_id=vehicle.id)  # Redirect to booking page if needed

    booked_service = booking.service  # The booked service associated with the vehicle

    # Get all available optional parts
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost based on the booked service and selected part
        total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0)

        # Create the Billing record
        billing = Billing.objects.create(
            booking=booking,
            part=selected_part,
            part_quantity=int(request.POST.get("quantity", 1)),
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to the invoice generation page
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Key Points in This Adjustment:

Check for Booking: If there’s no booking for the vehicle (if not booking), the user is redirected to a booking page (redirect('create_booking', vehicle_id=vehicle.id)). This ensures that the booking is done before the billing process.
Calculate Billing: If a booking exists, the booked_service is retrieved from that booking, and the billing is processed.
Redirect After Billing Creation: After the billing record is created, the user is redirected to the invoice generation page.

Now, you might need to add the booking creation functionality if it hasn't been set up. Here's how that might look:

Sample `create_booking` View:

python
def create_booking(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    if request.method == 'POST':
        # Assuming you have a form for creating bookings
        form = BookingForm(request.POST)
        if form.is_valid():
            booking = form.save(commit=False)
            booking.vehicle = vehicle  # Link the booking to the vehicle
            booking.save()
            return redirect('create_billing', vehicle_id=vehicle.id)  # Redirect to billing after booking
    else:
        form = BookingForm()

    return render(request, 'billing/create_booking.html', {'form': form, 'vehicle': vehicle})

In this case:

The user will be directed to the booking form if no booking exists for the vehicle.
After the booking is created, they will be redirected to the billing page.

Conclusion:

After creating the vehicle, you need to ensure that the vehicle has an associated booking before proceeding to billing.
If there is no booking, prompt the user to create one.
Once a booking is available, proceed with the billing as you’ve outlined in your code.

Let me know if you'd like further clarification or assistance with setting up the booking flow!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } label { font-size: 16px; color: #333; } .info { background: #f0f0f0; padding: 10px; border-radius: 5px; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <div class="info"> <p><strong>Service:</strong> {{ booked_service.name }}</p> <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p> </div> <form method="post"> {% csrf_token %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part"> <option value="" selected>Select a Part</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <br><br> <label for="quantity">Quantity (if applicable):</label> <input type="number" name="quantity" id="quantity" value="1" min="1" step="1"> <br><br> {% endif %} <label for="payment_method">Payment Method:</label> <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash"> <br><br> <label for="payment_amount">Payment Amount (KSH):</label> <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount"> <br><br> <button type="submit">Proceed to Invoice</button> </form> </div> </body> </html> should this not take the details from booking refine

Yes, you are correct. The billing page should take the details from the booking that was made earlier. Let's refine the template and view so that the correct details are passed and displayed properly.

The idea is that the booked_service should already be associated with the vehicle's booking, so you don't need to manually input service details.

Changes to the Template:

Service Information: Instead of inputting service information manually, we should just display the service associated with the booking.
Parts and Quantity: When displaying the parts, ensure that the quantity input is optional and only available if parts are selected.
Payment Details: These will be handled by the user, but we'll display all necessary fields.

Here’s the updated HTML template:

Updated `create_billing.html` Template:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        .info {
            background: #f0f0f0;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            padding: 12px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part" id="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <br><br>

        <label for="quantity">Quantity (if applicable):</label>
        <input type="number" name="quantity" id="quantity" value="1" min="1" step="1">
        <br><br>
        {% endif %}

        <label for="payment_method">Payment Method:</label>
        <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash">
        <br><br>

        <label for="payment_amount">Payment Amount (KSH):</label>
        <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount">
        <br><br>

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>

</body>
</html>

Key Changes:

Service Display: The booked_service is used to show the name and cost of the service directly from the booking.
Optional Parts: We display available parts only if they exist, and users can select a part. The quantity field is also included to allow users to specify how many parts they are taking.
Payment Details: Input fields for payment method and amount are provided as usual.

Refining the `create_billing` View:

The key change in your create_billing view is that the booked_service and vehicle are already being passed into the template, and we should ensure that all relevant details from the booking are included.

Here’s a refined version of your view:

python
def create_billing(request, vehicle_id):
    # Fetch the vehicle using the provided vehicle_id
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the latest booked service for the vehicle (assuming the vehicle can have multiple bookings)
    booking = vehicle.booking_set.first()  # Or adjust to get the latest or relevant booking
    if not booking:
        # Handle the case where no booking exists for the vehicle
        return render(request, "billing/home.html", {"message": "No service booked for this vehicle."})

    booked_service = booking.service

    # Get all optional parts
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost based on booked service and any selected part
        total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0)

        # Create a Billing record with the calculated total cost
        billing = Billing.objects.create(
            booking=booking,
            part=selected_part,
            part_quantity=int(request.POST.get("quantity", 1)),
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to the invoice generation page (adjust to your URL name)
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Explanation:

Get Booked Service: We're fetching the booked service from the vehicle.booking_set.first() method. If there’s no booking, we inform the user.
Parts Available: We're retrieving all parts and passing them to the template so users can select any part they need.
Form Submission: On form submission, we calculate the total cost, create the billing record, and redirect the user to the invoice generation page.

This should ensure that the billing page accurately reflects the service booked for the vehicle and gives users the option to add parts with the correct quantities.

Let me know if you need any further adjustments!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } label { font-size: 16px; color: #333; } .info { background: #f0f0f0; padding: 10px; border-radius: 5px; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <div class="info"> <p><strong>Service:</strong> {{ service.name }}</p> <p><strong>Service Cost:</strong> KSH {{ service.cost }}</p> </div> <form method="post"> {% csrf_token %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part" id="part"> <option value="" selected>Select a Part</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <br><br> <label for="quantity">Quantity (if applicable):</label> <input type="number" name="quantity" id="quantity" value="1" min="1" step="1"> <br><br> {% endif %} <label for="payment_method">Payment Method:</label> <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash"> <br><br> <label for="payment_amount">Payment Amount (KSH):</label> <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount"> <br><br> <button type="submit">Proceed to Invoice</button> </form> </div> </body> </html> nothing is showing here

It seems like you are passing the service to the template, but your view is using the booked_service. Let's make sure the correct context data is being passed to the template.

Here are a few things to check:

Ensure service is passed correctly: The template is referencing service, but in your view, it's likely called booked_service. If service is the correct variable name, make sure it’s passed in the context.
Correct Context Variable in the View: You should be passing the correct variables like booked_service or service (whichever you are using) in the render context in your view.

Step 1: Update the Template to Use `booked_service`

Update the template to reference booked_service instead of service.

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        .info {
            background: #f0f0f0;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            padding: 12px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part" id="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <br><br>

        <label for="quantity">Quantity (if applicable):</label>
        <input type="number" name="quantity" id="quantity" value="1" min="1" step="1">
        <br><br>
        {% endif %}

        <label for="payment_method">Payment Method:</label>
        <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash">
        <br><br>

        <label for="payment_amount">Payment Amount (KSH):</label>
        <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount">
        <br><br>

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>

</body>
</html>

Step 2: Update the View to Pass `booked_service`

Ensure the correct booked_service is passed into the template context. In the view, it should look something like this:

python
def create_billing(request, vehicle_id):
    # Fetch the vehicle using the provided vehicle_id
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the latest booked service for the vehicle (assuming the vehicle can have multiple bookings)
    booking = vehicle.booking_set.first()  # Or adjust to get the latest or relevant booking
    if not booking:
        # Handle the case where no booking exists for the vehicle
        return render(request, "billing/home.html", {"message": "No service booked for this vehicle."})

    booked_service = booking.service

    # Get all optional parts
    parts = Part.objects.all()

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Key Points:

booked_service is passed from the view to the template.
The template should use booked_service.name and booked_service.cost.
Make sure that the context data in the render method of your view is correct and matches the variables being used in the template.

This should allow the details of the service to be correctly displayed in the template. Let me know if you need any more assistance!

File "C:\Users\lau\Desktop\Projects\garage_system\garage\urls.py", line 39, in <module> path('billing/', include('billing.urls')), ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\urls\conf.py", line 39, in include urlconf_module = import_module(urlconf_module) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Program Files\Python312\Lib\importlib\__init__.py", line 90, in import_module return _bootstrap._gcd_import(name[level:], package, level) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "<frozen importlib._bootstrap>", line 1387, in _gcd_import File "<frozen importlib._bootstrap>", line 1360, in _find_and_load File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 935, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 995, in exec_module File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed File "C:\Users\lau\Desktop\Projects\garage_system\billing\urls.py", line 7, in <module> path('create_vehicle/<int:customer_id>/', create_vehicle, name='create_vehicle')

The error message indicates an issue with the urls.py in your billing app. Specifically, it seems to be related to the URL path configuration for create_vehicle in the billing/urls.py file. The problem is likely due to incorrect import or misconfiguration of the create_vehicle view.

Here's how you can troubleshoot and resolve the issue:

Step 1: Check the Import Statement for `create_vehicle`

In billing/urls.py, ensure you are correctly importing the create_vehicle view.

Your billing/urls.py file should look something like this:

python
from django.urls import path
from .views import create_vehicle, create_billing

urlpatterns = [
    path('create_vehicle/<int:customer_id>/', create_vehicle, name='create_vehicle'),
    path('create_billing/<int:vehicle_id>/', create_billing, name='create_billing'),
    # Add other URL patterns if necessary
]

Ensure that create_vehicle is correctly imported from your views.py.

Step 2: Ensure `create_vehicle` is Defined in `views.py`

Check that create_vehicle is correctly defined in your views.py within the billing app. It should look like this:

python
from django.shortcuts import render, get_object_or_404, redirect
from .models import Customer, Vehicle
from .forms import VehicleForm

def create_vehicle(request, customer_id):
    customer = get_object_or_404(Customer, id=customer_id)  # Get customer safely
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Link vehicle to the customer
            vehicle.save()
            return redirect('create_billing', vehicle_id=vehicle.id)
    else:
        form = VehicleForm()
    return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer})

Step 3: Check for Any Typos or Errors

Ensure that all function names (create_vehicle, create_billing) match exactly between the views.py and urls.py.
Double-check the URL patterns in urls.py to make sure they are correctly mapped.
Check that all required imports are included.

Step 4: Restart the Server

Sometimes, changes made to urls.py or views.py require restarting the Django development server. If you haven't done so already, restart the server:

bash
python manage.py runserver

After making sure all the imports and URL mappings are correct, this error should be resolved.

Let me know if you're still encountering issues!

If nothing is being displayed in the <h1> and <div class="info"> sections, there are a few potential issues that could be causing this:

Data Not Being Passed Correctly: Make sure that vehicle and booked_service are being passed correctly from your view. If one of these variables is missing or None, the template will not render the expected values.

Check Your View Logic: Ensure that vehicle and booked_service are properly assigned in your create_billing view. For example:

python
def create_billing(request, vehicle_id):
    # Fetch the vehicle using the provided vehicle_id
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the latest booked service for the vehicle
    booking = vehicle.booking_set.first()  # Or adjust to get the latest or relevant booking
    if not booking:
        # Handle the case where no booking exists for the vehicle
        return render(request, "billing/home.html", {"message": "No service booked for this vehicle."})

    booked_service = booking.service  # Ensure this is not None

    # Get all optional parts
    parts = Part.objects.all()

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Ensure that booking.service is not None.
If there are no bookings or services, make sure you return a suitable error or message.

Check Template Variable Names: Ensure that the template variables vehicle and booked_service are spelled correctly in both the view and template.

Check for Template Rendering Errors: If booked_service is None or an invalid value, you should have a fallback for when the service is missing. You could use conditional rendering like this:

html
<h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

<div class="info">
    {% if booked_service %}
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    {% else %}
        <p>No service booked for this vehicle.</p>
    {% endif %}
</div>

Verify Data in the Database:
- Check your database to make sure that vehicle has bookings associated with it and that the bookings have valid services.
- If you're using the Django admin, confirm that the service field for the booking is populated correctly.
Debugging: Add a simple print statement in your create_billing view to ensure the data is being fetched correctly:
```
python
print(f"Vehicle: {vehicle.make} {vehicle.model}")
print(f"Booked Service: {booked_service.name} - {booked_service.cost}")
```
This can help you verify if the values are being correctly passed to the template.

Let me know if you're still not seeing the expected output, and I'll help further debug!

It seems like you're trying to redirect to the create_billing page after successfully adding a vehicle, but the issue may be with the URL being used for the redirection. In your case, you are redirecting to create_billing using vehicle.id, but you're not passing the correct vehicle ID in the URL, or the URL pattern may be incorrect.

Here's what you can do to resolve the issue:

Ensure Your URL Pattern is Correct: Ensure that the URL pattern for create_billing is correctly defined in your urls.py file. It should look something like this:
```
python
# In billing/urls.py
path('create_billing/<int:vehicle_id>/', views.create_billing, name='create_billing'),
```
Check Redirection URL in View: In your create_vehicle view, when you successfully save the vehicle, you should redirect to the create_billing URL and pass the vehicle ID in the URL. This part seems correct, but ensure you're passing the correct vehicle.id:
```
python
return redirect('create_billing', vehicle_id=vehicle.id)
```
This will redirect the user to the correct create_billing URL with the vehicle ID.
URL in Template: In your template, make sure you use the URL correctly:
```
html
<a href="{% url 'create_billing' vehicle_id=vehicle.id %}" class="btn">Generate Billing</a>
```
Ensure that vehicle.id is available in your context and is not None. If you're getting the vehicle object correctly from the view, this should work.
Check the Flow: After adding the vehicle, the redirection should work. To make sure it works correctly, you can debug by adding print statements or inspecting the rendered HTML to verify that vehicle.id is being passed correctly.

You can also add a confirmation message before redirection to see if the redirection is happening correctly:
```
python
print(f"Redirecting to create_billing with vehicle_id: {vehicle.id}")
return redirect('create_billing', vehicle_id=vehicle.id)
```
Check the Browser URL: After the form is submitted and the redirection happens, check if the browser's address bar is showing the correct URL with the vehicle ID. The URL should look something like:
```
swift
/billing/create_billing/3/
```

If these steps don't resolve the issue, please share any specific errors you're seeing or further details about the behavior, and I'll assist you further!

Your URL pattern seems correct, and the redirection should work as expected with the create_billing URL. Given that everything looks okay from the URL perspective, let's troubleshoot the issue:

Steps to Debug:

Check Redirection URL in the create_vehicle View: In your create_vehicle view, ensure you're correctly passing the vehicle.id to the redirection:
```
python
return redirect('create_billing', vehicle_id=vehicle.id)
```
Ensure vehicle.id is Correct: Verify that vehicle.id is being correctly assigned and is not None. You can do this by printing the vehicle.id to check its value:
```
python
print(f"Vehicle ID: {vehicle.id}")
```
Place this before the return redirect line in your view.
Check if the Redirection Works: After saving the vehicle, ensure that your browser redirects to the correct URL (/billing/create_billing/vehicle_id/), where vehicle_id is the ID of the newly created vehicle.

For example, the URL in the browser's address bar should look like:
```
ruby
http://127.0.0.1:8000/billing/create_billing/3/
```
Check Template Redirection: In your template, ensure that you're using the correct URL to navigate to the create_billing page. If you're manually testing the link to create_billing, use this format:
```
html
<a href="{% url 'create_billing' vehicle_id=vehicle.id %}" class="btn">Generate Billing</a>
```
Confirm vehicle.id Exists: If you're still not seeing the redirection, you might want to check whether vehicle.id is actually passed correctly in the create_vehicle form. Try inspecting the form submission and making sure that the vehicle object is being correctly created and associated with the customer.
Check for Any Errors: If none of the above steps solve the issue, check your browser's developer console for any errors, and also look at the Django development server console for any potential error logs.

Example of What Should Happen:

The user submits the vehicle form.
The create_vehicle view is triggered.
The vehicle is created and linked to the customer.
The view then redirects to the create_billing view using the vehicle's ID.
The URL is updated to something like /billing/create_billing/3/.
The create_billing view fetches the vehicle and displays the billing form with the appropriate vehicle and service data.

If you still encounter issues, feel free to provide any specific error messages or behaviors you're seeing, and I'll help you troubleshoot further!

Your create_vehicle view looks mostly correct for redirecting to the create_billing page after the vehicle is created. However, there might be a few edge cases or other issues that could prevent the redirection from working as expected. Let’s go over some possible debugging steps and improvements.

Key Checks:

Confirm the URL is Correct: Ensure that in your urls.py, you have the correct path for the create_billing view:
```
python
path('create_billing/<int:vehicle_id>/', create_billing, name='create_billing'),
```

Check if Vehicle Creation is Successful: Add some debugging code to ensure the vehicle is being created and that vehicle.id is not None. You can print the vehicle.id before the redirection:

python
if form.is_valid():
    vehicle = form.save(commit=False)
    vehicle.customer = customer  # Link vehicle to the customer
    vehicle.save()
    print(f"Vehicle Created with ID: {vehicle.id}")  # Debugging line
    return redirect('create_billing', vehicle_id=vehicle.id)

Confirm create_billing URL in Your Template: In your template (for the redirection button or link), confirm that you are using the correct URL format, and ensure you’re passing vehicle.id:
```
html
<a href="{% url 'create_billing' vehicle_id=vehicle.id %}" class="btn">Generate Billing</a>
```
Check for any Errors in the Browser Console: If the page isn't redirecting as expected, check the browser’s developer tools (Console) for any JavaScript or network errors.
Check the Browser URL: After form submission, ensure the URL in the browser's address bar changes to /billing/create_billing/{vehicle_id}/.
Clear Cache / Cookies: Sometimes old URL patterns or cached information can interfere with the expected routing. Clear your browser cache and cookies to ensure no old redirects are affecting your testing.

Complete Example for `create_vehicle` View:

python
def create_vehicle(request, customer_id):
    customer = get_object_or_404(Customer, id=customer_id)  # Get customer safely
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Link vehicle to the customer
            vehicle.save()
            print(f"Vehicle Created with ID: {vehicle.id}")  # Debugging line
            return redirect('create_billing', vehicle_id=vehicle.id)
    else:
        form = VehicleForm()
    return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer})

Debugging Steps:

Test form submission: After you submit the vehicle form, check the Django development server’s console to ensure there’s no error when saving the vehicle.
Verify create_billing URL Pattern: Double-check that the URL pattern for create_billing correctly matches:
```
python
path('create_billing/<int:vehicle_id>/', create_billing, name='create_billing'),
```
Ensure Correct Redirection: If the above steps don’t solve the issue, print the final redirect URL to the console:
```
python
print(f"Redirecting to create_billing/{vehicle.id}")
```

After doing this, check if the redirect goes to the correct page. If the problem persists, please share any specific error messages you might encounter during the process.

It seems that the URL http://127.0.0.1:8000/billing/create_billing/9/ is correctly formed, assuming that 9 is the vehicle_id. However, if you're encountering issues such as the page not displaying the expected content or not functioning as expected, here are a few debugging steps to investigate:

1. Check the `create_billing` View:

Make sure the create_billing view is correctly fetching and rendering the data. For instance:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Check if there is a booking related to the vehicle
    booking = vehicle.booking_set.first()  # Get the latest booking (or adjust based on your requirements)
    
    if not booking:
        # If no booking is found, return a proper message
        return render(request, "billing/error.html", {"message": "No booking found for this vehicle."})

    # If a booking is found, retrieve the service associated with the booking
    booked_service = booking.service
    parts = Part.objects.all()  # Retrieve available parts

    # Handle the form submission for creating a billing record
    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost based on selected service and part (if any)
        total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0)

        # Create the billing record
        billing = Billing.objects.create(
            booking=booking,
            part=selected_part,
            part_quantity=int(request.POST.get("quantity", 1)),
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to the invoice generation page
        return redirect('generate_invoice', billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

2. Verify the URL Pattern for `create_billing`:

Ensure that the URL pattern is correctly defined in your urls.py:

python
path('create_billing/<int:vehicle_id>/', create_billing, name='create_billing'),

3. Check Template Rendering:

Ensure the correct data is being passed to the template. Here's an example template snippet where you would display the booked service details:

html
<h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

<div class="info">
    <p><strong>Service:</strong> {{ booked_service.name }}</p>
    <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
</div>

<form method="post">
    {% csrf_token %}

    {% if parts %}
    <label for="part">Select Part (Optional):</label>
    <select name="part" id="part">
        <option value="" selected>Select a Part</option>
        {% for part in parts %}
            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
        {% endfor %}
    </select>
    <br><br>

    <label for="quantity">Quantity (if applicable):</label>
    <input type="number" name="quantity" id="quantity" value="1" min="1" step="1">
    <br><br>
    {% endif %}

    <label for="payment_method">Payment Method:</label>
    <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash">
    <br><br>

    <label for="payment_amount">Payment Amount (KSH):</label>
    <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount">
    <br><br>

    <button type="submit">Proceed to Invoice</button>
</form>

4. Check for Errors:

Check for any error messages in the Django development server logs. If the server log shows any errors like TemplateDoesNotExist, it may indicate that there’s a missing template or incorrect file path.

5. Verify the Data:

Check whether the vehicle and booked_service data are being correctly passed to the template by printing them inside your view:

python
print(f"Vehicle: {vehicle.make} {vehicle.model}")
print(f"Booked Service: {booked_service.name} with cost: {booked_service.cost}")

If the booked_service is None, it might mean that the vehicle doesn't have an associated booking, or you're using the wrong lookup for the booking.

6. Make Sure Data Exists:

Ensure that a vehicle with the ID 9 has a booking and a service assigned to it in your database. If the vehicle has no associated bookings or services, you might not be able to display that data.

7. Check the Browser Console:

Open the developer tools in your browser (usually by pressing F12), and check the console for any JavaScript errors that might prevent the page from rendering correctly.

Summary:

Confirm that the vehicle_id is correctly passed to the view and that the vehicle object has the expected attributes.
Make sure the related booking and service objects are being fetched correctly.
Check the URL and template for any issues.
Use debugging statements (print) to ensure that the data is being passed correctly.

Let me know if you're still encountering issues, and I can guide you further.

It looks like everything is working up to the point where the create_vehicle view creates the vehicle and redirects you to the create_billing view for the vehicle with ID 9. However, since the billing page (create_billing) is not displaying the expected data, let's review the flow and debug further.

Here’s what might be happening and how to debug it:

1. Check if the Vehicle Has a Booking:

The create_billing view depends on the vehicle having an associated booking, but based on the log, it's unclear whether the vehicle has one.

Ensure that you have bookings for the vehicle. If the vehicle does not have an associated booking, the booked_service will be None, and this could lead to empty content being displayed.

Modify your view to log the presence of a booking and the associated service:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)
    print(f"Vehicle Created with ID: {vehicle.id}")

    # Get the first booking related to the vehicle
    booking = vehicle.booking_set.first()  # Or adjust based on your logic
    if not booking:
        # No booking found for the vehicle
        print("No booking found for this vehicle.")
        return render(request, "billing/error.html", {"message": "No booking found for this vehicle."})

    booked_service = booking.service
    if not booked_service:
        # No service associated with the booking
        print("No service found for the booking.")
        return render(request, "billing/error.html", {"message": "No service found for this booking."})

    # Log the booked service
    print(f"Booked Service: {booked_service.name} with cost {booked_service.cost}")

    # Proceed with the rest of the logic
    parts = Part.objects.all()  # All available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost based on selected part and service
        total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0)

        # Create a new billing record
        billing = Billing.objects.create(
            booking=booking,
            part=selected_part,
            part_quantity=int(request.POST.get("quantity", 1)),
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to invoice generation page
        return redirect('generate_invoice', billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

2. Check the `booking` and `service` in the Template:

Make sure that the booked_service object is being passed correctly to the template and is not None. You can check this in your template by adding a debugging section:

html
<h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

{% if booked_service %}
    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>
{% else %}
    <p>No service found for this booking.</p>
{% endif %}

<form method="post">
    {% csrf_token %}

    {% if parts %}
    <label for="part">Select Part (Optional):</label>
    <select name="part" id="part">
        <option value="" selected>Select a Part</option>
        {% for part in parts %}
            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
        {% endfor %}
    </select>
    <br><br>

    <label for="quantity">Quantity (if applicable):</label>
    <input type="number" name="quantity" id="quantity" value="1" min="1" step="1">
    <br><br>
    {% endif %}

    <label for="payment_method">Payment Method:</label>
    <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash">
    <br><br>

    <label for="payment_amount">Payment Amount (KSH):</label>
    <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount">
    <br><br>

    <button type="submit">Proceed to Invoice</button>
</form>

3. Check the Database for Bookings:

Ensure that the Vehicle object you're working with actually has a booking in the database. You can do this by checking the Booking table and making sure that there is a booking associated with vehicle.id = 9.

4. Check the `Parts` Availability:

If parts are not showing up, make sure there are parts available in the Part model. You can check this in the Django admin panel or by running a query in the shell.

5. Check the Server Logs:

If everything looks correct but you're still not getting the expected output, check your server logs for any errors or warnings related to this view.

Summary:

Ensure that the vehicle has a booking and that the booking has a service associated with it.
Add debug print statements to check if the data is being fetched correctly.
Use conditionals in the template to handle cases where the service or parts are not available.
Check your database to confirm that the vehicle and related bookings are properly set up.

Let me know if you need further assistance with this!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } label { font-size: 16px; color: #333; } .info { background: #f0f0f0; padding: 10px; border-radius: 5px; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <div class="info"> <p><strong>Service:</strong> {{ booked_service.name }}</p> <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p> </div> <form method="post"> {% csrf_token %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part" id="part"> <option value="" selected>Select a Part</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <br><br> <label for="quantity">Quantity (if applicable):</label> <input type="number" name="quantity" id="quantity" value="1" min="1" step="1"> <br><br> {% endif %} <label for="payment_method">Payment Method:</label> <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash"> <br><br> <label for="payment_amount">Payment Amount (KSH):</label> <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount"> <br><br> <button type="submit">Proceed to Invoice</button> </form> </div> </body> </html>

It looks like you're trying to render a billing page where the vehicle, service, and available parts are displayed, and a form is presented for entering payment details. If nothing is displaying for the {{ booked_service.name }} and {{ booked_service.cost }}, here's a checklist to help you debug and improve the rendering process:

1. Check the View Logic

Ensure that the booked_service is being correctly passed from your view to the template. In the create_billing view (or the relevant view), you should have logic similar to this:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)
    print(f"Vehicle Created with ID: {vehicle.id}")

    # Get the first booking related to the vehicle
    booking = vehicle.booking_set.first()  # Or adjust based on your logic
    if not booking:
        return render(request, "billing/error.html", {"message": "No booking found for this vehicle."})

    booked_service = booking.service
    if not booked_service:
        return render(request, "billing/error.html", {"message": "No service found for this booking."})

    # Log the booked service
    print(f"Booked Service: {booked_service.name} with cost {booked_service.cost}")

    parts = Part.objects.all()  # All available parts

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

2. Check Template Variable

In your template, ensure that you're using the correct variable names and conditions to render the data. For instance:

html
<h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

{% if booked_service %}
    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>
{% else %}
    <p>No service found for this booking.</p>
{% endif %}

<form method="post">
    {% csrf_token %}

    {% if parts %}
    <label for="part">Select Part (Optional):</label>
    <select name="part" id="part">
        <option value="" selected>Select a Part</option>
        {% for part in parts %}
            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
        {% endfor %}
    </select>
    <br><br>

    <label for="quantity">Quantity (if applicable):</label>
    <input type="number" name="quantity" id="quantity" value="1" min="1" step="1">
    <br><br>
    {% endif %}

    <label for="payment_method">Payment Method:</label>
    <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash">
    <br><br>

    <label for="payment_amount">Payment Amount (KSH):</label>
    <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount">
    <br><br>

    <button type="submit">Proceed to Invoice</button>
</form>

3. Database Check

Make sure that the booking object is correctly related to the vehicle object and that it has a service associated with it. You can check this directly in the Django admin interface or through the Django shell:

bash
$ python manage.py shell

Then, you can run queries to verify if the booking and service are correctly associated:

python
vehicle = Vehicle.objects.get(id=9)  # Replace with your vehicle ID
booking = vehicle.booking_set.first()
print(booking)
print(booking.service)

4. Ensure Data Is Populated

Make sure that the service associated with the booking has a valid name and cost fields. You can also log these values in your view to verify they are being fetched correctly:

python
print(f"Booked Service: {booked_service.name} with cost {booked_service.cost}")

5. Handle Missing Data

If booked_service or parts is missing, your template can provide an appropriate fallback message:

html
{% if booked_service %}
    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>
{% else %}
    <p>No service associated with this booking.</p>
{% endif %}

{% if parts %}
    <label for="part">Select Part (Optional):</label>
    <select name="part" id="part">
        <option value="" selected>Select a Part</option>
        {% for part in parts %}
            <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
        {% endfor %}
    </select>
    <br><br>
{% else %}
    <p>No parts available.</p>
{% endif %}

6. Test with Hardcoded Values

To make sure everything is set up correctly, try temporarily hardcoding some values in the view and check if the data shows up in the template:

python
booked_service = Service.objects.first()  # Hardcode a service for testing

Conclusion

Verify data: Ensure that the vehicle, booking, and service data are properly fetched and available.
Handle missing data: Add checks in the template and views for cases when data is not found.
Test with logs: Use print statements in your views to confirm what data is being passed to the template.

Let me know if this helps or if you need further assistance!

def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) print(f"Vehicle Created with ID: {vehicle.id}") # Get the first booking related to the vehicle booking = vehicle.booking_set.first() # Or adjust based on your logic if not booking: # No booking found for the vehicle print("No booking found for this vehicle.") return render(request, "billing/error.html", {"message": "No booking found for this vehicle."}) booked_service = booking.service if not booked_service: # No service associated with the booking print("No service found for the booking.") return render(request, "billing/error.html", {"message": "No service found for this booking."}) # Log the booked service print(f"Booked Service: {booked_service.name} with cost {booked_service.cost}") # Proceed with the rest of the logic parts = Part.objects.all() # All available parts if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None # Calculate total cost based on selected part and service total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0) # Create a new billing record billing = Billing.objects.create( booking=booking, part=selected_part, part_quantity=int(request.POST.get("quantity", 1)), total_cost=total_cost, payment_method=request.POST.get("payment_method"), payment_amount=request.POST.get("payment_amount"), ) # Redirect to invoice generation page return redirect('generate_invoice', billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts }) this is the view have used <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } label { font-size: 16px; color: #333; } .info { background: #f0f0f0; padding: 10px; border-radius: 5px; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <div class="info"> <p><strong>Service:</strong> {{ booked_service.name }}</p> <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p> </div> <form method="post"> {% csrf_token %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part" id="part"> <option value="" selected>Select a Part</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <br><br> <label for="quantity">Quantity (if applicable):</label> <input type="number" name="quantity" id="quantity" value="1" min="1" step="1"> <br><br> {% endif %} <label for="payment_method">Payment Method:</label> <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash"> <br><br> <label for="payment_amount">Payment Amount (KSH):</label> <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount"> <br><br> <button type="submit">Proceed to Invoice</button> </form> </div> </body> </html> check if the html matches the functionality

Your code looks mostly good, but there are a few things we can improve to ensure that the HTML matches the functionality in the view and that everything is working properly.

View:

Context Variables: The view is correctly passing vehicle, booked_service, and parts to the template.
POST Handling: The view correctly handles the form submission, fetching the selected part and quantity, calculating the total cost, and creating a billing entry.

HTML:

Service Information: The booked_service.name and booked_service.cost should be rendered as expected.
Parts Dropdown: The dropdown for selecting parts is rendered only if parts are available. This seems to be correctly handled in your view (parts = Part.objects.all()).
Payment Method: The form includes fields for the payment method and amount.

Areas to Check:

1. Selected Part Handling:

Your view handles the selected part and quantity using the following logic:

python
part_id = request.POST.get("part")
selected_part = Part.objects.get(id=part_id) if part_id else None

Make sure that the part field is correctly passed and that it is part of the form when the user submits it.

2. Error Handling for Missing Parts:

If the part dropdown is empty or the part selected is invalid (i.e., it’s not in the database), you may want to handle such cases gracefully in the view. For example, if selected_part is None, you could set the total cost to only include the service cost.

3. Payment Amount Validation:

Make sure the payment amount entered is correctly validated on the server-side and matches the total_cost.

Suggested Improvements:

Form Field for Payment Amount: You might want to calculate and display the total cost dynamically for the user to confirm the amount, based on the selected part and quantity.

You could modify the view to calculate the total cost and pass it to the template:
```
python
total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0)
```

Display Calculated Total Cost in the Template: After calculating the total cost in your view, pass it to the template and display it before the user submits the form.

In your view:

python
return render(request, "billing/create_billing.html", {
    "vehicle": vehicle,
    "booked_service": booked_service,
    "parts": parts,
    "total_cost": total_cost  # Pass the calculated total cost
})

In your template:

html
<div class="info">
    <p><strong>Total Cost:</strong> KSH {{ total_cost }}</p>
</div>

Form Handling:
- If you want to dynamically update the total cost as the user selects parts or changes quantities, consider using JavaScript (or Django forms with JavaScript) to handle this on the front end.

Final Template Example:

Here's how you can modify the template to display the calculated total cost:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        .info {
            background: #f0f0f0;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            padding: 12px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <div class="info">
        <p><strong>Total Cost:</strong> KSH {{ total_cost }}</p> <!-- Show total cost here -->
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part" id="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <br><br>

        <label for="quantity">Quantity (if applicable):</label>
        <input type="number" name="quantity" id="quantity" value="1" min="1" step="1">
        <br><br>
        {% endif %}

        <label for="payment_method">Payment Method:</label>
        <input type="text" name="payment_method" id="payment_method" required placeholder="e.g. Credit Card, Cash">
        <br><br>

        <label for="payment_amount">Payment Amount (KSH):</label>
        <input type="number" name="payment_amount" id="payment_amount" required step="0.01" placeholder="Enter payment amount">
        <br><br>

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>

</body>
</html>

Conclusion:

Ensure your view passes the correct total_cost to the template.
Display the total_cost in the template so that users can see it before submitting the form.
If desired, use JavaScript for dynamic updates based on form inputs.

Let me know if you'd like further assistance!

TemplateDoesNotExist at /billing/create_billing/9/ billing/error.html Request Method: GET Request URL: http://127.0.0.1:8000/billing/create_billing/9/ Django Version: 5.1.7 Exception Type: TemplateDoesNotExist Exception Value: billing/error.html Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\loader.py, line 19, in get_template Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 11:43:12 +0000

The error TemplateDoesNotExist: billing/error.html occurs because Django is trying to render the billing/error.html template, but it cannot find it.

To resolve this, you have two options:

Option 1: Create the `error.html` Template

You need to create a file named error.html in the templates/billing/ directory. Here’s a simple example for the error template:

Create billing/error.html inside the templates/billing/ folder in your project structure.

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Error</title>
</head>
<body>
    <h1>Error: {{ message }}</h1>
    <p><a href="{% url 'billing' %}">Go back to the billing home</a></p>
</body>
</html>

Ensure the templates directory is properly set up in your Django settings (settings.py):

python
TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],  # Ensure this points to your templates directory
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

Option 2: Handle the Error Differently (Optional)

If you want to handle the error in a different way or don't want to use the error.html template, you can return a simple message in the view, instead of rendering a template.

For example, modify the view to return an HttpResponse instead of rendering a template:

python
from django.http import HttpResponse

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)
    print(f"Vehicle Created with ID: {vehicle.id}")

    # Get the first booking related to the vehicle
    booking = vehicle.booking_set.first()  # Or adjust based on your logic
    if not booking:
        # No booking found for the vehicle
        print("No booking found for this vehicle.")
        return HttpResponse("No booking found for this vehicle.", status=400)

    booked_service = booking.service
    if not booked_service:
        # No service associated with the booking
        print("No service found for the booking.")
        return HttpResponse("No service found for this booking.", status=400)

    # Log the booked service
    print(f"Booked Service: {booked_service.name} with cost {booked_service.cost}")

    # Proceed with the rest of the logic
    parts = Part.objects.all()  # All available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost based on selected part and service
        total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0)

        # Create a new billing record
        billing = Billing.objects.create(
            booking=booking,
            part=selected_part,
            part_quantity=int(request.POST.get("quantity", 1)),
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to invoice generation page
        return redirect('generate_invoice', billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Summary:

Option 1: Create the billing/error.html template to display the error message when no booking or service is found.
Option 2: Modify the view to return an HTTP response with a simple error message instead of rendering a template.

Let me know if you need further assistance with either option!

The issue here is that the error message No booking found for this vehicle. is being triggered because the vehicle you just created doesn't have any associated bookings. In the create_billing view, you're trying to get the first booking related to the vehicle, but there is no booking available, which causes the view to return a Bad Request error.

To resolve this issue, you can:

Option 1: Add Booking Association

Make sure that the vehicle you just created has an associated booking, which is needed for the billing process. You should ensure that a booking is made for the vehicle before proceeding with billing.

You can do this in two ways:

Manually create a booking for the vehicle before proceeding with the billing.
Ensure a booking is created automatically when a vehicle is created, if that's part of your business logic.

Here’s an example of how you can create a booking for the vehicle in the create_vehicle view (after saving the vehicle):

python
def create_vehicle(request, customer_id):
    customer = get_object_or_404(Customer, id=customer_id)
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Link vehicle to the customer
            vehicle.save()

            # Create a booking for the vehicle (assuming Booking is a model related to Vehicle)
            booking = Booking.objects.create(vehicle=vehicle, service=<some_service>, date=<some_date>)

            print(f"Vehicle Created with ID: {vehicle.id} and Booking ID: {booking.id}")

            return redirect('create_billing', vehicle_id=vehicle.id)
    else:
        form = VehicleForm()
    return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer})

In this example, a Booking is created for the vehicle once it's saved. You will need to replace <some_service> and <some_date> with appropriate values based on your use case.

Option 2: Handle Missing Booking Gracefully

If creating a booking isn't required immediately, you can modify your view to check if the booking exists and display a more user-friendly message without raising a Bad Request error.

For example, you can modify your view like this:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)
    print(f"Vehicle Created with ID: {vehicle.id}")

    # Get the first booking related to the vehicle
    booking = vehicle.booking_set.first()  # Or adjust based on your logic
    if not booking:
        # No booking found for the vehicle
        print("No booking found for this vehicle.")
        return render(request, "billing/error.html", {"message": "No booking found for this vehicle. Please create a booking first."})

    booked_service = booking.service
    if not booked_service:
        # No service associated with the booking
        print("No service found for the booking.")
        return render(request, "billing/error.html", {"message": "No service found for this booking."})

    # Log the booked service
    print(f"Booked Service: {booked_service.name} with cost {booked_service.cost}")

    # Proceed with the rest of the logic
    parts = Part.objects.all()  # All available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None

        # Calculate total cost based on selected part and service
        total_cost = booked_service.cost + (selected_part.cost * int(request.POST.get("quantity", 1)) if selected_part else 0)

        # Create a new billing record
        billing = Billing.objects.create(
            booking=booking,
            part=selected_part,
            part_quantity=int(request.POST.get("quantity", 1)),
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to invoice generation page
        return redirect('generate_invoice', billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

In this updated view, if no booking is found, the user is redirected to an error page with a friendly message rather than getting a Bad Request error.

Next Steps:

If booking is required for billing, you should ensure a booking exists before redirecting to the create_billing view.
If booking can be created later, handle the error gracefully and guide the user to create a booking first.

Let me know how you'd like to proceed, and I can assist further.

from django.shortcuts import get_object_or_404, redirect, render from django.http import HttpResponse from .models import Vehicle, Booking, Part, Billing def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Get the latest booking for the vehicle latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first() if not latest_booking: return HttpResponse("No service booked for this vehicle.", status=400) booked_service = latest_booking.service parts = Part.objects.all() if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) billing = Billing.objects.create( vehicle=vehicle, service=booked_service, part=selected_part, total_cost=total_cost ) return redirect("generate_invoice", billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts }) ✅ No service selection – The page automatically fetches the booked service. ✅ Service details displayed – The service name and cost are shown in a simple info box. ✅ Optional parts selection – If parts are needed, the user can add them. ✅ Total cost calculation – The system adds up service + optional part cost. ✅ Redirects to invoice – Once billing is created, it moves to the invoice page. i want this implemented

Your updated create_billing function is well-structured and meets all the criteria you listed. Below is the improved version of your create_billing function, ensuring all functionalities work as expected:

✅ Implemented Features:

Auto-fetches the latest booking for the vehicle
Displays the booked service name and cost
Allows optional selection of parts
Calculates total cost dynamically
Redirects to the invoice page once billing is created

Updated `create_billing` View:

python
from django.shortcuts import get_object_or_404, redirect, render
from django.http import HttpResponse
from .models import Vehicle, Booking, Part, Billing

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service
    parts = Part.objects.all()  # Fetch available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        
        # Calculate total cost (service + optional part cost)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record
        billing = Billing.objects.create(
            vehicle=vehicle,
            service=booked_service,
            part=selected_part,
            total_cost=total_cost
        )

        # Redirect to invoice page
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

✅ Updated `create_billing.html` Template

This template properly displays the service details, provides an optional part selection, and allows form submission to process billing.

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        .info {
            background: #f0f0f0;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            padding: 12px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part" id="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <br><br>
        {% endif %}

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>

</body>
</html>

💡 Features & Improvements

✅ Auto-fetches service: The template automatically displays the booked service name and cost.
✅ Displays optional parts: If parts exist, they are selectable.
✅ Calculates total cost: Adds service + optional part.
✅ Redirects to invoice: Redirects to "generate_invoice" upon successful billing creation.

🎯 Next Steps

Test the flow by creating a vehicle and ensuring it has an active booking before accessing create_billing.
Confirm invoice generation works as expected.

Let me know if you need any refinements! 🚀

The 400 Bad Request error means that there is an issue with the request, likely because no booking exists for the vehicle with ID 16.

🔍 Debugging Steps:

Check if the vehicle has a booking

Run this in Django shell to confirm:

python
from billing.models import Vehicle, Booking

vehicle = Vehicle.objects.get(id=16)  # Check if the vehicle exists
booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
print(booking)  # Should return a Booking object or None

If None is returned, that means no booking exists for this vehicle.

Ensure a booking exists before billing
If a vehicle does not have a booking, you need to first create a booking before attempting to generate billing.
Modify the create_billing view to handle this error gracefully
Instead of a 400 error, you can redirect the user or show a proper message.

✅ Fixed `create_billing` View:

python
from django.shortcuts import get_object_or_404, redirect, render
from django.http import HttpResponse
from .models import Vehicle, Booking, Part, Billing

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
    
    if not latest_booking:
        # Redirect user to a page where they can create a booking first
        return render(request, "billing/no_booking.html", {"vehicle": vehicle})

    booked_service = latest_booking.service
    parts = Part.objects.all()  

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        billing = Billing.objects.create(
            vehicle=vehicle,
            service=booked_service,
            part=selected_part,
            total_cost=total_cost
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

🔹 Create a `billing/no_booking.html` Template

This page informs the user that no booking exists and provides an option to create one.

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>No Booking Found</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            text-align: center;
            background-color: #f4f4f9;
        }
        .container {
            margin-top: 50px;
            padding: 20px;
            background: white;
            width: 50%;
            margin: auto;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        a {
            display: inline-block;
            margin-top: 20px;
            padding: 10px 20px;
            background-color: #ff5733;
            color: white;
            text-decoration: none;
            border-radius: 5px;
        }
        a:hover {
            background-color: #e74c3c;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>No Booking Found for {{ vehicle.make }} {{ vehicle.model }}</h1>
    <p>Please create a service booking before proceeding with billing.</p>
    <a href="{% url 'create_booking' vehicle.id %}">Create Booking</a>
</div>

</body>
</html>

🎯 Next Steps

Try accessing 127.0.0.1:8000/billing/create_billing/16/ again.
- If no booking exists, it should now redirect to a message instead of showing a 400 error.
Create a booking for the vehicle before billing.
- Go to the booking creation page and ensure the vehicle gets a service assigned.

Let me know if you need any refinements! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from billing.models import Vehicle, Booking >>> >>> vehicle = Vehicle.objects.get(id=16) # Check if the vehicle exists >>> booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first() >>> print(booking) # Should return a Booking object or None None >>> >>>

Since booking is None, this confirms that no booking exists for the vehicle with ID 16.

🔹 How to Fix This

✅ 1. Create a Booking for Vehicle ID 16

Since billing depends on an existing booking, you need to manually create one.

Run the following in the Django shell:

python
from billing.models import Booking, Service

# Get the vehicle
vehicle = Vehicle.objects.get(id=16)

# Select a service (adjust the ID based on your database)
service = Service.objects.first()  # Get any available service

# Create a booking for the vehicle
booking = Booking.objects.create(vehicle=vehicle, service=service)
print(f"Booking created with ID: {booking.id}")

Now, when you run:

python
booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
print(booking)

It should return a booking object instead of None.

✅ 2. Try Accessing Billing Again

Now that a booking exists, try visiting:

ruby
http://127.0.0.1:8000/billing/create_billing/16/

It should load the billing page properly.

✅ 3. Ensure Booking is Created Automatically

Modify your workflow so that a booking is automatically created when a vehicle is added.
For example, in your create_vehicle view:

python
from django.shortcuts import get_object_or_404, redirect, render
from .models import Vehicle, Booking, Service

def create_vehicle(request, customer_id):
    customer = get_object_or_404(Customer, id=customer_id)
    
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer
            vehicle.save()
            
            # Automatically create a booking for the vehicle
            default_service = Service.objects.first()  # Assign a default service
            Booking.objects.create(vehicle=vehicle, service=default_service)

            return redirect('create_billing', vehicle_id=vehicle.id)

    else:
        form = VehicleForm()
    
    return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer})

This ensures that whenever a vehicle is created, it gets a default service booking. That way, you won’t run into this issue again.

🎯 Next Steps

✅ Manually create a booking for existing vehicles
✅ Ensure new vehicles get a booking automatically
✅ Try creating billing again and confirm if it works 🚀

Let me know if you hit any issues! 🔧

File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 998, in save_base updated = self._save_table( ^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 1161, in _save_table results = self._do_insert( ^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 1202, in _do_insert return manager._insert( ^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1847, in _insert return query.get_compiler(using=using).execute_sql(returning_fields) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\compiler.py", line 1836, in execute_sql cursor.execute(sql, params) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 122, in execute return super().execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 79, in execute return self._execute_with_wrappers( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 92, in _execute_with_wrappers return executor(sql, params, many, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 100, in _execute with self.db.wrap_database_errors: File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ django.db.utils.IntegrityError: NOT NULL constraint failed: billing_booking.service_id >>> print(f"Booking created with ID: {booking.id}") Traceback (most recent call last): File "<console>", line 1, in <module> AttributeError: 'NoneType' object has no attribute 'id'

The error "NOT NULL constraint failed: billing_booking.service_id" means that your Booking model requires a service_id, but it's not being provided when creating a booking.

🔹 Why is this happening?

The service_id field in your Booking model is required (NOT NULL), but no service is being assigned when creating a booking.
This happens if Service.objects.first() returns None, meaning there are no service records in the database.

✅ How to Fix It

1️⃣ Check if Services Exist

Run this in the Django shell:

python
from billing.models import Service

services = Service.objects.all()
print(services)

If the output is an empty list ([]), then there are no services in the database.

2️⃣ Create a Service (If None Exist)

If there are no services, create one:

python
service = Service.objects.create(name="Basic Maintenance", cost=5000)
print(f"Created service with ID: {service.id}")

Now, when you run:

python
Service.objects.all()

You should see at least one service in the database.

3️⃣ Now, Try Creating a Booking Again

Once a service exists, run:

python
from billing.models import Booking, Vehicle, Service

vehicle = Vehicle.objects.get(id=16)  # Replace 16 with your actual vehicle ID
service = Service.objects.first()  # Get an available service

booking = Booking.objects.create(vehicle=vehicle, service=service)
print(f"Booking created with ID: {booking.id}")

This should now work without errors.

🔹 Prevent This Error in the Future

✅ Ensure a Default Service is Assigned

Modify your create_vehicle view to assign a default service automatically:

python
def create_vehicle(request, customer_id):
    customer = get_object_or_404(Customer, id=customer_id)
    
    if request.method == 'POST':
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer
            vehicle.save()
            
            # Assign a default service if available
            default_service = Service.objects.first()
            if default_service:
                Booking.objects.create(vehicle=vehicle, service=default_service)
            else:
                print("⚠️ No services found! Create one before proceeding.")

            return redirect('create_billing', vehicle_id=vehicle.id)

    else:
        form = VehicleForm()
    
    return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer})

Now, new vehicles will always have a booking with a valid service.

🎯 Next Steps

Check if services exist (Service.objects.all()).
Create a service if needed (Service.objects.create(name="Basic Maintenance", cost=5000)).
Create a booking with a valid service (Booking.objects.create(vehicle=vehicle, service=service)).
Test http://127.0.0.1:8000/billing/create_billing/16/ again.

Try this and let me know if it works! 🚀

TypeError at /billing/create_billing/17/ Billing() got unexpected keyword arguments: 'vehicle', 'service' Request Method: POST Request URL: http://127.0.0.1:8000/billing/create_billing/17/ Django Version: 5.1.7 Exception Type: TypeError Exception Value: Billing() got unexpected keyword arguments: 'vehicle', 'service' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py, line 567, in __init__ Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 16:03:20 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 75, in create_billing billing = Billing.objects.create( … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py, line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py, line 677, in create obj = self.model(**kwargs) ^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py, line 567, in __init__ raise TypeError( ^

🔍 Error Analysis

The error:

TypeError: Billing() got unexpected keyword arguments: 'vehicle', 'service'

means that your Billing model does not have vehicle and service fields.

🔹 Solution

1️⃣ Check Your `Billing` Model

In billing/models.py, find your Billing model and ensure it has the correct fields.

python
class Billing(models.Model):
    booking = models.ForeignKey(Booking, on_delete=models.CASCADE)
    part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True)
    part_quantity = models.IntegerField(default=1)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2)
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

2️⃣ Update Your `create_billing` View

Your Billing.objects.create() line should match the model fields:

python
billing = Billing.objects.create(
    booking=latest_booking,  # Use booking instead of vehicle/service
    part=selected_part,
    part_quantity=int(request.POST.get("quantity", 1)),
    total_cost=total_cost,
    payment_method=request.POST.get("payment_method"),
    payment_amount=request.POST.get("payment_amount"),
)

3️⃣ Apply Database Migrations (If Needed)

If your model is missing fields, apply migrations:

sh
python manage.py makemigrations
python manage.py migrate

Now, try again! 🚀

def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Get the latest booking for the vehicle latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first() if not latest_booking: return HttpResponse("No service booked for this vehicle.", status=400) booked_service = latest_booking.service parts = Part.objects.all() # Fetch available parts if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None # Calculate total cost (service + optional part cost) total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) # Create billing record billing = Billing.objects.create( vehicle=vehicle, service=booked_service, part=selected_part, total_cost=total_cost ) # Redirect to invoice page return redirect("generate_invoice", billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts }) update

🔹 Updated `create_billing` View

Your current code is trying to create a Billing record with fields (vehicle, service) that don't exist in the Billing model. The correct field should be booking (linked to a Booking instance).

Here’s the updated and corrected version:

✅ Fixed Code:

python
from django.shortcuts import get_object_or_404, redirect, render
from django.http import HttpResponse
from .models import Vehicle, Booking, Part, Billing

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service
    parts = Part.objects.all()  # Fetch available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        
        # Calculate total cost (service + optional part cost)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record (using booking instead of vehicle/service)
        billing = Billing.objects.create(
            booking=latest_booking,  # Link to booking
            part=selected_part,
            part_quantity=int(request.POST.get("quantity", 1)),
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to invoice page
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

🔹 Key Fixes & Changes

✅ Replaced vehicle and service with booking in the Billing.objects.create() function.
✅ Added part_quantity, payment_method, and payment_amount to match the model.
✅ Ensured proper error handling if no booking exists.

🛠 Next Steps

Run migrations to ensure the Billing model has all required fields:

sh
python manage.py makemigrations
python manage.py migrate

Test the form submission and confirm it redirects to the invoice page.

This should now work smoothly! 🚀 Let me know if you run into any issues. 😊

Your models are well-structured, but I noticed a few things that could be improved:

✅ Key Fixes & Improvements

Ensure consistency: In Billing, make payment_method optional in case a user hasn't paid yet.
Improve total cost calculation: It should automatically update based on parts and quantity.
Ensure clean data: Add constraints to prevent negative values for part_quantity and payment_amount.
Improve relationships: Consider adding related_name to ForeignKey fields for better reverse lookups.

🔹 Updated Model with Fixes

python
from django.db import models
from accounts.models import CustomUser

class Customer(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True)
    name = models.CharField(max_length=100)
    email = models.EmailField(unique=True)  # Ensures no duplicate emails
    phone = models.CharField(max_length=15, unique=True)  # Ensures unique phone numbers

    def __str__(self):
        return self.name

class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE, related_name="vehicles")
    make = models.CharField(max_length=50)
    model = models.CharField(max_length=50)
    registration_number = models.CharField(max_length=20, unique=True)  # Ensures no duplicate registrations

    def __str__(self):
        return f"{self.make} {self.model} - {self.registration_number}"

class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

class Part(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

class Booking(models.Model):
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings")
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

class Billing(models.Model):
    booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True, related_name="billings")
    part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True, related_name="billings")
    part_quantity = models.PositiveIntegerField(default=1)  # Prevents negative quantities
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)  
    payment_method = models.CharField(max_length=50, choices=[('cash', 'Cash'), ('mpesa', 'Mpesa'), ('card', 'Card')], null=True, blank=True)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2, default=0.00)

    def calculate_total(self):
        total = self.booking.service.cost if self.booking else 0
        if self.part:
            total += self.part.cost * self.part_quantity
        return total

    def save(self, *args, **kwargs):
        self.total_cost = self.calculate_total()
        super().save(*args, **kwargs)

    def __str__(self):
        return f"Billing for {self.booking} - Total: KSH {self.total_cost}"

🔹 Changes & Why They Matter

✅ Ensures Unique Data:

email, phone, and registration_number are unique to avoid duplicates.

✅ Prevents Data Issues:

part_quantity is now PositiveIntegerField to prevent negative values.
payment_method is now optional (nullable) to allow unpaid bills.
payment_amount defaults to 0.00 to prevent errors.

✅ Improves Querying:

Added related_name to ForeignKey fields for better reverse lookups.
Example:

python
customer.vehicles.all()  # Gets all vehicles for a customer
vehicle.bookings.all()  # Gets all bookings for a vehicle
booking.billings.all()  # Gets all billings for a booking

✅ Better Total Calculation:

calculate_total() ensures the total is always accurate before saving.

🔹 Next Steps

Apply Migrations:

sh
python manage.py makemigrations
python manage.py migrate

Test Creating a Billing Record and ensure totals update correctly.
Confirm the Payment Options Work Properly.

This version ensures data integrity, prevents errors, and improves query efficiency. 🚀 Let me know if you need any tweaks! 😊

The IntegrityError: UNIQUE constraint failed: new__billing_vehicle.registration_number means that Django is trying to insert a duplicate vehicle registration number, but your Vehicle model enforces uniqueness on registration_number.

🔍 Why is this happening?

This issue typically occurs when:

You are trying to create a new Vehicle record with an already existing registration_number.
There are duplicate records in your database due to previous tests or migrations.
A form or script is accidentally submitting duplicate vehicle entries.

✅ How to Fix

1️⃣ Check for Existing Duplicate Vehicles

Run this command in Django shell to see if there are duplicate records:

sh
python manage.py shell

Then, run:

python
from billing.models import Vehicle
duplicates = Vehicle.objects.values('registration_number').annotate(count=models.Count('id')).filter(count__gt=1)
print(list(duplicates))

👉 If this shows duplicates, you need to delete them before proceeding.

2️⃣ Delete Duplicate Vehicles (Manually or via Query)

Option 1: Manually via Django Admin

Go to http://127.0.0.1:8000/admin/
Navigate to the Vehicle model.
Find and delete duplicate vehicles.

Option 2: Using Django Shell If you found duplicates, delete them with:

python
Vehicle.objects.filter(registration_number='ABC123').delete()

(Replace 'ABC123' with the actual duplicate registration number.)

3️⃣ Modify Your Code to Prevent Duplicates

If your code is accidentally creating duplicate vehicles, modify your vehicle creation logic to check for existing records before creating a new one.

Fix your vehicle creation function

Modify your create_vehicle function like this:

python
from django.shortcuts import get_object_or_404
from django.http import HttpResponse
from .models import Vehicle, Customer

def create_vehicle(request):
    if request.method == "POST":
        reg_number = request.POST.get("registration_number")
        make = request.POST.get("make")
        model = request.POST.get("model")
        customer_id = request.POST.get("customer_id")

        customer = get_object_or_404(Customer, id=customer_id)

        # Check if vehicle already exists
        existing_vehicle = Vehicle.objects.filter(registration_number=reg_number).first()
        if existing_vehicle:
            return HttpResponse("Vehicle with this registration number already exists!", status=400)

        # Create new vehicle
        vehicle = Vehicle.objects.create(
            customer=customer,
            make=make,
            model=model,
            registration_number=reg_number
        )

        return HttpResponse(f"Vehicle Created with ID: {vehicle.id}")

👉 This ensures you never create duplicate vehicles.

4️⃣ Apply Migrations to Ensure Database Consistency

Once you've deleted duplicates and fixed your code, run:

sh
python manage.py makemigrations
python manage.py migrate

🚀 Final Steps

✅ Check if duplicates exist & delete them
✅ Modify code to prevent future duplicates
✅ Run migrations to apply any necessary changes

This should fix the error! Try again and let me know if it persists. 😊

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from billing.models import Vehicle >>> duplicates = Vehicle.objects.values('registration_number').annotate(count=models.Count('id')).filter(count__gt=1) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'models' is not defined >>> print(list(duplicates)) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'duplicates' is not defined >>>

You got a "NameError: name 'models' is not defined" because the models module wasn't imported in the shell.

✅ Fix

Before running the query, import models from Django:

python
from django.db import models
from billing.models import Vehicle

duplicates = Vehicle.objects.values('registration_number').annotate(count=models.Count('id')).filter(count__gt=1)

print(list(duplicates))  # This should return a list of duplicate registration numbers

🛠 If You Find Duplicates

If duplicates exist, delete them manually in the Django admin (http://127.0.0.1:8000/admin/) or use this command:

python
for entry in duplicates:
    reg_number = entry["registration_number"]
    Vehicle.objects.filter(registration_number=reg_number).exclude(id=Vehicle.objects.filter(registration_number=reg_number).first().id).delete()

🔹 This keeps one record and deletes all duplicates.

Let me know if you need more help! 🚀

You have duplicate vehicle records! 🚨

"KAM 403S" appears 14 times
"KCL 414K" appears 3 times

🛠 Fix: Remove Duplicate Entries

Keep only one unique record per registration number.

1️⃣ Delete All Duplicates (Except One)

python
for entry in duplicates:
    reg_number = entry["registration_number"]
    Vehicle.objects.filter(registration_number=reg_number).exclude(id=Vehicle.objects.filter(registration_number=reg_number).first().id).delete()

🔹 This keeps the first record and deletes all duplicates for each registration number.

2️⃣ Enforce Unique Constraint

To prevent this from happening again, update your Vehicle model:

python
class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    make = models.CharField(max_length=50)
    model = models.CharField(max_length=50)
    registration_number = models.CharField(max_length=20, unique=True)  # UNIQUE constraint added

    def __str__(self):
        return f"{self.make} {self.model} - {self.registration_number}"

Then, run migrations:

bash
python manage.py makemigrations
python manage.py migrate

This should fix your UNIQUE constraint failed error! 🚀 Let me know if you need help.

>>> duplicates = Vehicle.objects.values('registration_number').annotate(count=models.Count('id')).filter(count__gt=1) >>> >>> print(list(duplicates)) # This should return a list of duplicate registration numbers [{'registration_number': 'KAM 403S', 'count': 14}, {'registration_number': 'KCL 414K', 'count': 3}] >>> for entry in duplicates: ... reg_number = entry["registration_number"] ... Vehicle.objects.filter(registration_number=reg_number).exclude(id=Vehicle.objects.filter(registration_number=reg_number).first().id).delete() ... (14, {'billing.Booking': 1, 'billing.Vehicle': 13}) (2, {'billing.Vehicle': 2}) >>>

It looks like the duplicate records for "KAM 403S" and "KCL 414K" have been successfully removed! 🎉

Breakdown:

(14, {'billing.Booking': 1, 'billing.Vehicle': 13})
This means 13 Vehicle records were deleted for the "KAM 403S" registration number, leaving only 1.
(2, {'billing.Vehicle': 2})
This means 2 Vehicle records were deleted for "KCL 414K", leaving 1.

Next Steps:

To ensure no further issues:

Enforce the unique constraint in the Vehicle model, as we discussed earlier, to prevent future duplicate entries.

Update the Vehicle model to:

python
class Vehicle(models.Model):
    registration_number = models.CharField(max_length=20, unique=True)  # Ensure uniqueness

Migrate the changes:

bash
python manage.py makemigrations
python manage.py migrate

This will enforce a unique constraint on the registration_number field, avoiding future duplicates.

If you need further help, just let me know! 🚀

now exiting InteractiveConsole... (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations No changes detected (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: Applying billing.0002_alter_billing_booking_alter_billing_part_and_more... OK (venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py runserver Watching for file changes with StatReloader Performing system checks... System check identified no issues (0 silenced). March 31, 2025 - 19:21:15 Django version 5.1.7, using settings 'garage.settings' Starting development server at http://127.0.0.1:8000/ Quit the server with CTRL-BREAK. done

Let's proceed with implementing the invoice functionality!

Here’s a general flow for generating an invoice:

Create an Invoice Model (If you haven’t already) – This model will capture details like the billing information, customer details, payment status, etc.
Create a View for Invoice Generation – This will generate the invoice, either as a viewable page or a downloadable PDF.
Update Your Billing View to Redirect to Invoice Generation – We’ll link the billing creation to invoice generation.

1. Invoice Model

If you haven’t created an Invoice model, here’s an example:

python
from django.db import models

class Invoice(models.Model):
    billing = models.OneToOneField(Billing, on_delete=models.CASCADE)
    invoice_number = models.CharField(max_length=50, unique=True)
    date_created = models.DateTimeField(auto_now_add=True)
    total_amount = models.DecimalField(max_digits=10, decimal_places=2)
    payment_status = models.CharField(max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid')

    def __str__(self):
        return f"Invoice #{self.invoice_number} - {self.payment_status}"

    def generate_invoice_number(self):
        # Example logic for generating an invoice number
        return f"INV-{self.id}"

    def save(self, *args, **kwargs):
        if not self.invoice_number:
            self.invoice_number = self.generate_invoice_number()
        super().save(*args, **kwargs)

2. Invoice View

Next, we need to create a view to generate the invoice:

python
from django.shortcuts import render, get_object_or_404
from django.http import HttpResponse
from .models import Billing, Invoice

def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)
    
    # Create the invoice
    invoice = Invoice.objects.create(
        billing=billing,
        total_amount=billing.total_cost,
    )
    
    # Optionally, you can send the invoice as a downloadable PDF or render it as an HTML page.
    
    return render(request, 'billing/invoice.html', {
        'invoice': invoice,
        'billing': billing,
    })

3. Redirect to Invoice Generation in the Billing View

Make sure your create_billing view redirects to the generate_invoice view:

python
from django.shortcuts import redirect

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)
    
    # Get the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record
        billing = Billing.objects.create(
            vehicle=vehicle,
            service=booked_service,
            part=selected_part,
            total_cost=total_cost,
            payment_method=request.POST.get("payment_method"),
            payment_amount=request.POST.get("payment_amount"),
        )

        # Redirect to the invoice page after billing is created
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

4. Invoice Template (`invoice.html`)

Create a simple template for displaying the invoice details:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice - {{ invoice.invoice_number }}</title>
</head>
<body>
    <h1>Invoice: {{ invoice.invoice_number }}</h1>
    <p>Date: {{ invoice.date_created }}</p>
    <p>Total Amount: KSH {{ invoice.total_amount }}</p>
    <p>Payment Status: {{ invoice.payment_status }}</p>

    <h3>Billing Details:</h3>
    <p>Vehicle: {{ billing.vehicle.registration_number }} ({{ billing.vehicle.make }} {{ billing.vehicle.model }})</p>
    <p>Service: {{ billing.service.name }} - KSH {{ billing.service.cost }}</p>

    {% if billing.part %}
        <p>Part: {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p>
    {% endif %}
</body>
</html>

Final Steps:

Create the invoice number logic in the Invoice model.
Add payment logic to update the payment_status field once paid.
Implement PDF generation if needed (using libraries like ReportLab or WeasyPrint for PDFs).

Let me know if you want to proceed with the PDF generation or any adjustments! 😊

IntegrityError at /billing/create_billing/8/ NOT NULL constraint failed: billing_billing.payment_method Request Method: POST Request URL: http://127.0.0.1:8000/billing/create_billing/8/ Django Version: 5.1.7 Exception Type: IntegrityError Exception Value: NOT NULL constraint failed: billing_billing.payment_method Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py, line 354, in execute Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 16:30:09 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py, line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py, line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars The above exception (NOT NULL constraint failed: billing_billing.payment_method) was the direct cause of the following exception: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 76, in create_billing billing = Billing.objects.create(

The error you're encountering, NOT NULL constraint failed: billing_billing.payment_method, indicates that when creating a Billing record, the payment_method field is missing a value, and it is required by your model (i.e., it cannot be NULL).

Here are a few steps to fix this:

1. Ensure `payment_method` is in the POST data

In your create_billing view, you need to make sure that payment_method is coming from the form or POST data, as you're trying to create the Billing object with it.

Here's an updated version of your create_billing view to ensure payment_method is included in the POST data:

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service
    parts = Part.objects.all()  # Fetch available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        
        # Get the payment method from the POST data
        payment_method = request.POST.get("payment_method")
        if not payment_method:
            return HttpResponse("Payment method is required.", status=400)

        # Get the payment amount from the POST data
        payment_amount = request.POST.get("payment_amount")
        if not payment_amount:
            return HttpResponse("Payment amount is required.", status=400)
        
        # Calculate total cost (service + optional part cost)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record
        billing = Billing.objects.create(
            vehicle=vehicle,
            service=booked_service,
            part=selected_part,
            total_cost=total_cost,
            payment_method=payment_method,
            payment_amount=payment_amount
        )

        # Redirect to the invoice page after billing is created
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

2. Ensure Payment Fields Are in the Form (HTML)

Ensure your form includes both payment_method and payment_amount. For example, in your create_billing.html template:

html
<form method="post">
    {% csrf_token %}
    <!-- Other form fields for selecting service, parts, etc. -->

    <label for="payment_method">Payment Method</label>
    <input type="text" name="payment_method" id="payment_method" required>

    <label for="payment_amount">Payment Amount</label>
    <input type="number" name="payment_amount" id="payment_amount" required>

    <button type="submit">Create Billing</button>
</form>

3. Handle the `payment_method` and `payment_amount` correctly

Ensure both fields are required: Add the required attribute to the input fields in your HTML form to ensure they are not left empty.
Validate the values in the view: As shown in the create_billing view above, ensure the values are present before proceeding with the Billing creation.

By ensuring that payment_method and payment_amount are both in the form and correctly passed to the view, the IntegrityError should no longer occur.

Let me know how this goes! 😊

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } label { font-size: 16px; color: #333; } .info { background: #f0f0f0; padding: 10px; border-radius: 5px; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <div class="info"> <p><strong>Service:</strong> {{ booked_service.name }}</p> <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p> </div> <form method="post"> {% csrf_token %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part" id="part"> <option value="" selected>Select a Part</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <br><br> {% endif %} <button type="submit">Proceed to Invoice</button> </form> </div> </body> </html> create_billing.html <form method="post"> {% csrf_token %}  <label for="payment_method">Payment Method</label> <input type="text" name="payment_method" id="payment_method" required> <label for="payment_amount">Payment Amount</label> <input type="number" name="payment_amount" id="payment_amount" required> <button type="submit">Create Billing</button> </form> merge

Here's the merged create_billing.html template combining both the form for selecting the part (optional) and the fields for entering the payment method and payment amount:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 60%;
            margin: 30px auto;
            background-color: #fff;
            padding: 30px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }
        h1 {
            text-align: center;
            color: #333;
        }
        label {
            font-size: 16px;
            color: #333;
        }
        .info {
            background: #f0f0f0;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 15px;
        }
        button {
            background-color: #4CAF50;
            color: white;
            font-weight: bold;
            border: none;
            padding: 12px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s ease;
            border-radius: 4px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>

<div class="container">
    <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part" id="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <br><br>
        {% endif %}

        <label for="payment_method">Payment Method</label>
        <input type="text" name="payment_method" id="payment_method" required>

        <label for="payment_amount">Payment Amount</label>
        <input type="number" name="payment_amount" id="payment_amount" required>

        <br><br>

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>

</body>
</html>

Key Points:

Form Fields for Payment Method and Amount: I've added the payment_method and payment_amount fields right after the part selection (if available). These fields are required as per your earlier model structure.
Part Selection (Optional): The part selection remains optional and will only show if parts are available ({% if parts %}). This part of the form allows users to select any available parts for the service.

Now, this template combines the part selection and payment details into a single form. It will send both the payment_method, payment_amount, and selected part (if any) when submitted.

TypeError at /billing/create_billing/8/ Billing() got unexpected keyword arguments: 'vehicle', 'service' Request Method: POST Request URL: http://127.0.0.1:8000/billing/create_billing/8/ Django Version: 5.1.7 Exception Type: TypeError Exception Value: Billing() got unexpected keyword arguments: 'vehicle', 'service' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py, line 567, in __init__ Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 16:35:51 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 86, in create_billing billing = Billing.objects.create( … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py, line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py, line 677, in create obj = self.model(**kwargs) ^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py, line 567, in __init__ raise TypeError( ^ … Local vars Request inform

The error you're encountering, Billing() got unexpected keyword arguments: 'vehicle', 'service', indicates that you're passing arguments (vehicle, service) to the Billing.objects.create() method, but those fields don't exist directly in the Billing model as per your model definition.

Looking at your Billing model, the fields vehicle and service don't exist directly. Instead, Billing is related to Booking (via the booking field) and Part (via the part field). The issue arises because you're trying to create a Billing object and passing arguments that don't match the model's fields.

Solution:

You need to create the Billing object using the correct fields. Here’s how you can update your create_billing view:

python
from django.shortcuts import render, get_object_or_404, redirect
from .models import Vehicle, Booking, Part, Billing

def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service
    parts = Part.objects.all()  # Fetch available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = request.POST.get("payment_amount")

        # Calculate total cost (service + optional part cost)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record
        billing = Billing.objects.create(
            booking=latest_booking,  # Link to the booking instead of vehicle/service directly
            part=selected_part,
            payment_method=payment_method,
            payment_amount=payment_amount,
            total_cost=total_cost  # The total cost has already been calculated
        )

        # Redirect to invoice page (add your invoice view logic)
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

Changes made:

Correct Billing object creation:
- Instead of trying to pass vehicle and service directly to the Billing model, we link the Billing object to the existing Booking via the booking field.
- The part and payment_method fields are added as per the form.
- The total_cost is calculated before creating the Billing object.
Redirect after creating the billing:
- After creating the billing record, it redirects to the invoice page, where you can handle the generation of the invoice.

Make sure your form in create_billing.html correctly includes fields for the payment_method and payment_amount, which will be sent along with the other data when the form is submitted.

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Invoice - {{ invoice.invoice_number }}</title> </head> <body> <h1>Invoice: {{ invoice.invoice_number }}</h1> <p>Date: {{ invoice.date_created }}</p> <p>Total Amount: KSH {{ invoice.total_amount }}</p> <p>Payment Status: {{ invoice.payment_status }}</p> <h3>Billing Details:</h3> <p>Vehicle: {{ billing.vehicle.registration_number }} ({{ billing.vehicle.make }} {{ billing.vehicle.model }})</p> <p>Service: {{ billing.service.name }} - KSH {{ billing.service.cost }}</p> {% if billing.part %} <p>Part: {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p> {% endif %} </body> </html> design to look nice

To make the invoice look nicer and more organized, you can use CSS for styling. Here's an improved version of your HTML with added styles for a more professional and visually appealing invoice layout:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice - {{ invoice.invoice_number }}</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f4f9;
            margin: 0;
            padding: 0;
        }
        .container {
            width: 70%;
            margin: 30px auto;
            background-color: #fff;
            padding: 20px;
            box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            border: 1px solid #ddd;
        }
        h1, h3 {
            text-align: center;
            color: #333;
        }
        .invoice-header {
            text-align: center;
            margin-bottom: 30px;
        }
        .invoice-header p {
            margin: 5px 0;
        }
        .info-section, .billing-section {
            margin-top: 20px;
            background-color: #f9f9f9;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.1);
        }
        .info-section p, .billing-section p {
            font-size: 16px;
            color: #555;
        }
        .billing-details {
            margin-top: 20px;
            font-size: 14px;
            color: #333;
        }
        .billing-details p {
            margin-bottom: 10px;
        }
        .total-amount {
            font-size: 18px;
            font-weight: bold;
            color: #4CAF50;
            margin-top: 20px;
        }
        .payment-status {
            font-size: 16px;
            color: #FF5722;
            font-weight: bold;
        }
        .divider {
            border-top: 2px solid #ddd;
            margin: 20px 0;
        }
        .footer {
            text-align: center;
            font-size: 14px;
            color: #777;
            margin-top: 30px;
        }
    </style>
</head>
<body>

<div class="container">
    <div class="invoice-header">
        <h1>Invoice - {{ invoice.invoice_number }}</h1>
        <p>Date: {{ invoice.date_created }}</p>
        <div class="total-amount">
            <p>Total Amount: KSH {{ invoice.total_amount }}</p>
        </div>
    </div>

    <div class="info-section">
        <h3>Customer Details:</h3>
        <p><strong>Name:</strong> {{ customer.name }}</p>
        <p><strong>Email:</strong> {{ customer.email }}</p>
        <p><strong>Phone:</strong> {{ customer.phone }}</p>
    </div>

    <div class="divider"></div>

    <div class="billing-section">
        <h3>Billing Details:</h3>
        <p><strong>Vehicle:</strong> {{ billing.vehicle.registration_number }} ({{ billing.vehicle.make }} {{ billing.vehicle.model }})</p>
        <p><strong>Service:</strong> {{ billing.service.name }} - KSH {{ billing.service.cost }}</p>

        {% if billing.part %}
            <p><strong>Part:</strong> {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p>
        {% endif %}
    </div>

    <div class="divider"></div>

    <div class="payment-status">
        <p>Payment Status: {{ invoice.payment_status }}</p>
    </div>

    <div class="footer">
        <p>Thank you for your business!</p>
        <p>For any inquiries, please contact us at info@yourcompany.com</p>
    </div>
</div>

</body>
</html>

Key improvements:

Layout:
- The content is placed in a container with a max width of 70%, so it doesn’t stretch too wide on larger screens.
- Sections like customer details, billing details, and payment status are separated with a clean and modern look.
Typography and Colors:
- The font size for sections and the total amount is slightly increased for better readability.
- Colors for the total amount and payment status are highlighted with different colors (green for total and red for payment status) to draw attention.
Section Styling:
- Each section (like info-section and billing-section) has padding, background color, and border-radius for a neat card-like design.
- The divider class is used to create a thin separator between sections to improve structure.
Footer:
- Added a simple footer with a thank-you message and contact info.

This design will make the invoice look much more professional, clean, and easy to read.

IntegrityError at /billing/generate_invoice/2/ UNIQUE constraint failed: billing_invoice.invoice_number Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/2/ Django Version: 5.1.7 Exception Type: IntegrityError Exception Value: UNIQUE constraint failed: billing_invoice.invoice_number Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py, line 354, in execute Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 16:40:20 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py, line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py, line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars The above exception (UNIQUE constraint failed: billing_invoice.invoice_number) was the direct cause of the following exception: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 100, in generate_invoice invoice = Invoice.objects.create( … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py, line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py, line 679, in create obj.save(force_insert=True, using=self.db) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\models.py, line 82, in save super().save(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The error you're encountering indicates that there is an issue with the uniqueness of the invoice_number in your Invoice model. Specifically, it is trying to insert a new Invoice with an invoice_number that already exists in the database, which violates the unique constraint on that field.

How to fix this:

Check if the invoice_number is already in the database: Before creating a new invoice, you should ensure that the invoice_number is unique. If it already exists, you can either generate a new one or handle it appropriately.
Modify the generate_invoice view: Here's how you can modify your view to handle this:
- Ensure that each Invoice has a unique invoice_number by checking if one exists with the same invoice_number.
- If it exists, generate a new one or increment the last one.

Example Update to `generate_invoice`:

python
from django.db import IntegrityError
from django.shortcuts import render, get_object_or_404, redirect
from .models import Invoice, Billing

def generate_invoice(request, billing_id):
    # Get the billing object
    billing = get_object_or_404(Billing, id=billing_id)

    # Generate a unique invoice number, you can customize this logic
    invoice_number = "INV-001"  # Example static number or use your own logic to generate unique numbers
    try:
        while Invoice.objects.filter(invoice_number=invoice_number).exists():
            # Logic to generate a new unique invoice_number, e.g., incrementing or timestamp
            invoice_number = generate_new_invoice_number()  # Replace with your own function

        # Create the invoice
        invoice = Invoice.objects.create(
            invoice_number=invoice_number,
            billing=billing,
            total_amount=billing.total_amount,
            payment_status="Pending",
            date_created=datetime.now()
        )

        return render(request, 'invoice_template.html', {'invoice': invoice})

    except IntegrityError as e:
        # Handle error if the invoice creation fails (for some other reason)
        return render(request, 'error_template.html', {'error_message': str(e)})

How to Handle `invoice_number` Uniqueness:

If you want to ensure uniqueness without manually checking every time, you could also use a strategy to automatically increment or generate a new invoice_number based on the last generated invoice:

python
def generate_new_invoice_number():
    last_invoice = Invoice.objects.all().order_by('invoice_number').last()
    if last_invoice:
        # Assuming the invoice number is a number like "INV-001"
        last_number = int(last_invoice.invoice_number.split('-')[1])
        return f"INV-{last_number + 1:03d}"
    else:
        return "INV-001"

Conclusion:

Ensure that the invoice_number field is unique by checking for existing invoice numbers before creating a new one.
You can also customize the invoice_number generation logic to suit your needs (like auto-incrementing or using a timestamp).

Let me know if you need further assistance with this!

You need a function to generate a unique invoice_number. Here’s how you can do it:

Generate a Unique Invoice Number Function

Modify your generate_new_invoice_number function to create a unique invoice number dynamically.

python
from datetime import datetime
from .models import Invoice

def generate_new_invoice_number():
    """Generates a unique invoice number in the format INV-YYYYMMDD-XXX."""
    today = datetime.today().strftime('%Y%m%d')  # Format: YYYYMMDD
    last_invoice = Invoice.objects.filter(invoice_number__startswith=f"INV-{today}").order_by('-invoice_number').first()

    if last_invoice:
        last_number = int(last_invoice.invoice_number.split('-')[-1])  # Extract last number
        new_number = last_number + 1
    else:
        new_number = 1  # Start with 1 if no invoices exist for today

    return f"INV-{today}-{new_number:03d}"  # Format: INV-YYYYMMDD-001

Update Your `generate_invoice` View

Modify your view to use this function:

python
from django.db import IntegrityError
from django.shortcuts import render, get_object_or_404
from .models import Invoice, Billing
from datetime import datetime

def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)

    try:
        invoice_number = generate_new_invoice_number()

        invoice = Invoice.objects.create(
            invoice_number=invoice_number,
            billing=billing,
            total_amount=billing.total_amount,
            payment_status="Pending",
            date_created=datetime.now()
        )

        return render(request, 'invoice_template.html', {'invoice': invoice})

    except IntegrityError as e:
        return render(request, 'error_template.html', {'error_message': str(e)})

What This Does

Generates a unique invoice number in the format INV-YYYYMMDD-XXX (e.g., INV-20250331-001).
Checks existing invoices for the current date and increments the last invoice number.
Ensures that no duplicate invoice numbers are created.

Try this and let me know if you need any modifications! 🚀

AttributeError at /billing/generate_invoice/2/ 'Billing' object has no attribute 'total_amount' Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/2/ Django Version: 5.1.7 Exception Type: AttributeError Exception Value: 'Billing' object has no attribute 'total_amount' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 118, in generate_invoice Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 16:46:52 +0000

It looks like your Billing model doesn't have a total_amount attribute. You probably need to calculate it based on the service and parts.

Fix: Ensure `Billing` has a total amount calculation

1. Add a method to calculate total amount

In your Billing model (models.py), add this:

python
from django.db import models

class Billing(models.Model):
    vehicle = models.ForeignKey("Vehicle", on_delete=models.CASCADE)
    service = models.ForeignKey("Service", on_delete=models.CASCADE)
    part = models.ForeignKey("Part", on_delete=models.SET_NULL, null=True, blank=True)
    part_quantity = models.PositiveIntegerField(default=1)

    def calculate_total_amount(self):
        """Calculate total cost including service and optional parts."""
        total = self.service.cost
        if self.part:
            total += self.part.cost * self.part_quantity
        return total

2. Update the `generate_invoice` view

Modify your generate_invoice view to use calculate_total_amount():

python
from django.shortcuts import render, get_object_or_404
from .models import Invoice, Billing
from datetime import datetime
from django.db import IntegrityError

def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)

    try:
        invoice_number = generate_new_invoice_number()  # Ensure this function exists

        invoice = Invoice.objects.create(
            invoice_number=invoice_number,
            billing=billing,
            total_amount=billing.calculate_total_amount(),  # Use the method
            payment_status="Pending",
            date_created=datetime.now()
        )

        return render(request, 'invoice_template.html', {'invoice': invoice})

    except IntegrityError as e:
        return render(request, 'error_template.html', {'error_message': str(e)})

Why This Works

calculate_total_amount() dynamically calculates the invoice amount based on service and optional parts.
Ensures total_amount is not missing and avoids the AttributeError.

Try this and let me know how it goes! 🚀

class Billing(models.Model): booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True, related_name="bookings") part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True, related_name="bookings") part_quantity = models.IntegerField(default=1) total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True) # Ensuring no NULL values payment_method = models.CharField(max_length=50) payment_amount = models.DecimalField(max_digits=10, decimal_places=2) def calculate_total(self): total = self.booking.service.cost if self.booking else 0 # Prevents crashes if booking is NULL if self.part: total += self.part.cost * self.part_quantity return total def save(self, *args, **kwargs): self.total_cost = self.calculate_total() # Ensure total cost is always set super().save(*args, **kwargs) def __str__(self): return f"Billing for {self.booking} - Total: KSH {self.total_cost}" class Invoice(models.Model): billing = models.OneToOneField(Billing, on_delete=models.CASCADE) invoice_number = models.CharField(max_length=50, unique=True) date_created = models.DateTimeField(auto_now_add=True) total_amount = models.DecimalField(max_digits=10, decimal_places=2) payment_status = models.CharField(max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid') def __str__(self): return f"Invoice #{self.invoice_number} - {self.payment_status}" def generate_invoice_number(self): # Example logic for generating an invoice number return f"INV-{self.id}" def save(self, *args, **kwargs): if not self.invoice_number: self.invoice_number = self.generate_invoice_number() super().save(*args, **kwargs)

Issues & Fixes

Invoice Number Conflict (IntegrityError)
- generate_invoice_number() uses self.id, which is None until the instance is saved.
- Fix: Save the invoice first, then update invoice_number.
total_amount Not Being Set
- You are not explicitly assigning billing.total_cost to total_amount.
- Fix: Set total_amount = billing.total_cost.

Updated Code with Fixes

Billing Model (No Changes, Just for Reference)

python
class Billing(models.Model):
    booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True, related_name="bookings")
    part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True, related_name="bookings")
    part_quantity = models.IntegerField(default=1)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)  # Allow NULL to avoid errors
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

    def calculate_total(self):
        total = self.booking.service.cost if self.booking else 0  # Prevent crash if booking is NULL
        if self.part:
            total += self.part.cost * self.part_quantity
        return total

    def save(self, *args, **kwargs):
        self.total_cost = self.calculate_total()  # Automatically set total cost
        super().save(*args, **kwargs)

    def __str__(self):
        return f"Billing for {self.booking} - Total: KSH {self.total_cost}"

Updated Invoice Model

python
from django.utils.timezone import now

class Invoice(models.Model):
    billing = models.OneToOneField(Billing, on_delete=models.CASCADE)
    invoice_number = models.CharField(max_length=50, unique=True, blank=True)  # Allow blank initially
    date_created = models.DateTimeField(default=now)  # Ensure timestamp
    total_amount = models.DecimalField(max_digits=10, decimal_places=2)
    payment_status = models.CharField(
        max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid'
    )

    def generate_invoice_number(self):
        return f"INV-{self.pk}"  # Use PK after initial save

    def save(self, *args, **kwargs):
        if not self.invoice_number:
            super().save(*args, **kwargs)  # Save first to get a PK
            self.invoice_number = self.generate_invoice_number()
        self.total_amount = self.billing.total_cost  # Ensure total amount is copied
        super().save(*args, **kwargs)  # Save again with invoice number

    def __str__(self):
        return f"Invoice #{self.invoice_number} - {self.payment_status}"

Why This Works

✅ Avoids IntegrityError: First saves the invoice to get an id, then generates invoice_number.
✅ Prevents None in total_amount: Ensures it’s set from billing.total_cost.

Now, your invoices should generate without errors! 🚀

AttributeError at /billing/generate_invoice/3/ 'Billing' object has no attribute 'total_amount' Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/3/ Django Version: 5.1.7 Exception Type: AttributeError Exception Value: 'Billing' object has no attribute 'total_amount' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 118, in generate_invoice Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 16:52:55 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 118, in generate_invoice total_amount=billing.total_amount, ^^^^^^^^^^^^^^^^^^^^ … Local vars Variable Value billing <Billing: Billing for KYM 914 - Basic Maintenance - Total: KSH 5000.00> billing_id 3 invoice_number 'INV-20250331-001' request <WSGIRequest: GET '/billing/generate_invoice/3/'>

Issue: `Billing` Object Has No Attribute `total_amount`

The error occurs in your generate_invoice view because you're trying to access billing.total_amount, but Billing has no such field. Instead, it has total_cost.

Fix

Change billing.total_amount to billing.total_cost in your generate_invoice view.

Updated Code for `generate_invoice` View

python
def generate_invoice(request, billing_id):
    billing = Billing.objects.get(id=billing_id)

    invoice = Invoice.objects.create(
        billing=billing,
        total_amount=billing.total_cost,  # ✅ FIXED: Use total_cost instead of total_amount
        payment_status="Unpaid"
    )

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Why This Works

✅ Fixes AttributeError: Uses the correct field name (total_cost).
✅ Ensures Correct Invoice Amount: Pulls the actual cost from the billing object.

Now your invoices should generate without errors! 🚀

File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py", line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\billing\views.py", line 118, in generate_invoice total_amount=billing.total_amount, ^^^^^^^^^^^^^^^^^^^^ AttributeError: 'Billing' object has no attribute 'total_amount'. Did you mean: 'total_cost'? [31/Mar/2025 19:52:46] "GET /billing/generate_invoice/2/ HTTP/1.1" 500 69195 [31/Mar/2025 19:52:49] "GET /billing/create_billing/8/ HTTP/1.1" 200 2101 [31/Mar/2025 19:52:55] "POST /billing/create_billing/8/ HTTP/1.1" 302 0 Internal Server Error: /billing/generate_invoice/3/ Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py", line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py", line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\billing\views.py", line 118, in generate_invoice total_amount=billing.total_amount, ^^^^^^^^^^^^^^^^^^^^ AttributeError: 'Billing' object has no attribute 'total_amount'. Did you mean: 'total_cost'?

The error message clearly states that Billing has no attribute named total_amount. Instead, your model defines total_cost.

Solution: Update Your `generate_invoice` View

Modify generate_invoice to use billing.total_cost instead of billing.total_amount.

Updated Code:

python
def generate_invoice(request, billing_id):
    billing = Billing.objects.get(id=billing_id)

    invoice = Invoice.objects.create(
        billing=billing,
        total_amount=billing.total_cost,  # ✅ Use 'total_cost' instead of 'total_amount'
        payment_status="Unpaid"
    )

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Why This Works

✅ Fixes the AttributeError
✅ Uses the correct field (total_cost) for invoice generation

This will now generate invoices correctly without breaking. 🚀

IntegrityError at /billing/generate_invoice/3/ UNIQUE constraint failed: billing_invoice.billing_id Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/3/ Django Version: 5.1.7 Exception Type: IntegrityError Exception Value: UNIQUE constraint failed: billing_invoice.billing_id Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py, line 354, in execute Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Mon, 31 Mar 2025 16:54:47 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py, line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py, line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars The above exception (UNIQUE constraint failed: billing_invoice.billing_id) was the direct cause of the following exception: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 112, in generate_invoice invoice = Invoice.objects.create( … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py, line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py, line 679, in create obj.save(force_insert=True, using=self.db) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\models.py, line 81, in save super().save(*args, **kwargs) # Save first to get a PK ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars Variable Value __class__ <class 'billing.models.Invoice'> args () kwargs {'force_insert': True, 'using': 'default'} self <Invoice: Invoice # - Unpaid>

Issue: UNIQUE Constraint Failed on `billing_id`

The error occurs because each Billing entry can only have one Invoice, as enforced by this line in your model:

python
billing = models.OneToOneField(Billing, on_delete=models.CASCADE)

This means if an invoice already exists for a given billing_id, trying to create another one will fail.

Solution: Check if an Invoice Already Exists Before Creating a New One

Modify your generate_invoice view to check if an invoice already exists for the given Billing entry.

Updated Code:

python
def generate_invoice(request, billing_id):
    billing = Billing.objects.get(id=billing_id)

    # Check if an invoice already exists
    invoice, created = Invoice.objects.get_or_create(
        billing=billing,
        defaults={
            "total_amount": billing.total_cost,  # ✅ Use 'total_cost'
            "payment_status": "Unpaid",
        }
    )

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Why This Fix Works

✅ Prevents duplicate invoices by checking if one exists first.
✅ Avoids IntegrityError since get_or_create() ensures only one invoice is created per billing_id.
✅ Uses total_cost instead of total_amount (fixing the previous error).

Now, if an invoice already exists, Django won't create a new one, preventing the UNIQUE constraint violation. 🚀

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Invoice - {{ invoice.invoice_number }}</title> </head> <body> <h1>Invoice: {{ invoice.invoice_number }}</h1> <p>Date: {{ invoice.date_created }}</p> <p>Total Amount: KSH {{ invoice.total_amount }}</p> <p>Payment Status: {{ invoice.payment_status }}</p> <h3>Billing Details:</h3> <p>Vehicle: {{ billing.vehicle.registration_number }} ({{ billing.vehicle.make }} {{ billing.vehicle.model }})</p> <p>Service: {{ billing.service.name }} - KSH {{ billing.service.cost }}</p> {% if billing.part %} <p>Part: {{ billing.part.name }} - KSH {{ billing.part.cost }} x {{ billing.part_quantity }}</p> {% endif %} </body> </html> design it to look nice

Here's a modern and professional invoice design using HTML and CSS.

Enhancements:

✅ Styled Header – Bold invoice title
✅ Neatly Organized Sections – Clear separation for invoice details, billing details, and pricing
✅ Table Format – Services and parts are neatly listed
✅ Better Font & Spacing – Improved readability

Updated Invoice Template:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice - {{ invoice.invoice_number }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 800px;
            margin: 20px auto;
            padding: 20px;
            border: 1px solid #ddd;
            border-radius: 8px;
            background-color: #f9f9f9;
        }
        h1 {
            color: #333;
            text-align: center;
        }
        .invoice-header {
            text-align: center;
            padding: 10px;
            background: #007bff;
            color: #fff;
            border-radius: 8px 8px 0 0;
        }
        .invoice-details {
            padding: 15px;
            background: #fff;
            border-radius: 0 0 8px 8px;
        }
        .info {
            margin-bottom: 10px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 15px;
        }
        table, th, td {
            border: 1px solid #ddd;
        }
        th, td {
            padding: 10px;
            text-align: left;
        }
        th {
            background: #007bff;
            color: #fff;
        }
        .total {
            font-size: 18px;
            font-weight: bold;
            text-align: right;
            margin-top: 20px;
        }
    </style>
</head>
<body>
    <div class="invoice-header">
        <h1>Invoice: {{ invoice.invoice_number }}</h1>
    </div>

    <div class="invoice-details">
        <p class="info"><strong>Date:</strong> {{ invoice.date_created }}</p>
        <p class="info"><strong>Payment Status:</strong> {{ invoice.payment_status }}</p>

        <h3>Billing Details:</h3>
        <p><strong>Vehicle:</strong> {{ billing.booking.vehicle.registration_number }} ({{ billing.booking.vehicle.make }} {{ billing.booking.vehicle.model }})</p>

        <table>
            <thead>
                <tr>
                    <th>Service/Part</th>
                    <th>Cost (KSH)</th>
                    <th>Quantity</th>
                    <th>Total (KSH)</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>{{ billing.booking.service.name }}</td>
                    <td>{{ billing.booking.service.cost }}</td>
                    <td>1</td>
                    <td>{{ billing.booking.service.cost }}</td>
                </tr>
                {% if billing.part %}
                <tr>
                    <td>{{ billing.part.name }}</td>
                    <td>{{ billing.part.cost }}</td>
                    <td>{{ billing.part_quantity }}</td>
                    <td>{{ billing.part.cost|floatformat:2|add:billing.part_quantity }}</td>
                </tr>
                {% endif %}
            </tbody>
        </table>

        <p class="total">Total Amount: KSH {{ invoice.total_amount }}</p>
    </div>
</body>
</html>

How It Looks:

Modern Header with Blue Background
Table Layout for Services & Parts
Clear Totals with bold font

Now your invoice looks clean and professional! 🚀 Let me know if you want any further customizations. 😊

Great! 🎉 Now that your invoice generation is working well, here are the next steps you can consider adding:

1️⃣ PDF Generation for Invoices

🔹 Convert the invoice into a downloadable PDF so customers can save or print it.
How? Use the reportlab or wkhtmltopdf library with Django.
👉 Install:

sh
pip install weasyprint

👉 Generate PDF in Django View:

python
from django.http import HttpResponse
from django.template.loader import render_to_string
import weasyprint

def generate_invoice_pdf(request, invoice_id):
    invoice = Invoice.objects.get(id=invoice_id)
    billing = invoice.billing

    html_content = render_to_string('invoice_template.html', {'invoice': invoice, 'billing': billing})
    pdf = weasyprint.HTML(string=html_content).write_pdf()

    response = HttpResponse(pdf, content_type='application/pdf')
    response['Content-Disposition'] = f'attachment; filename="invoice_{invoice.invoice_number}.pdf"'
    return response

👉 Add a Download Button in Your Template:

html
<a href="{% url 'generate_invoice_pdf' invoice.id %}" class="btn btn-primary">Download PDF</a>

2️⃣ Email Invoice to Customers

🔹 Automatically send the invoice via email once it's generated.
How? Use Django’s send_mail() function.
👉 Install Email Backend (if needed):

sh
pip install django-sendgrid-v5

👉 Send Email with Invoice PDF:

python
from django.core.mail import EmailMessage
from django.template.loader import render_to_string

def send_invoice_email(invoice):
    subject = f"Your Invoice #{invoice.invoice_number}"
    message = render_to_string('email_invoice_template.html', {'invoice': invoice})

    email = EmailMessage(subject, message, 'your_email@example.com', [invoice.billing.booking.customer.email])
    email.content_subtype = "html"
    email.send()

👉 Trigger Email in Your View:

python
send_invoice_email(invoice)

3️⃣ Add Payment Integration (Optional)

🔹 Allow customers to pay invoices online via M-Pesa, PayPal, or Stripe.
How? Integrate Django + a payment gateway.
👉 For M-Pesa (Kenya): Use Django Daraja
👉 For PayPal: Use Django PayPal
👉 For Card Payments: Use Stripe API

4️⃣ Invoice List Page & Search Filter

🔹 Create an Invoice Management Page where:
✅ Admins/customers can view all invoices
✅ Filter invoices by date, payment status, or customer name
✅ Mark invoices as Paid/Unpaid

Example View:

python
def invoice_list(request):
    invoices = Invoice.objects.all().order_by('-date_created')
    return render(request, 'invoice_list.html', {'invoices': invoices})

Example Template (invoice_list.html):

html
<table>
    <tr>
        <th>Invoice #</th>
        <th>Customer</th>
        <th>Date</th>
        <th>Status</th>
        <th>Actions</th>
    </tr>
    {% for invoice in invoices %}
    <tr>
        <td>{{ invoice.invoice_number }}</td>
        <td>{{ invoice.billing.booking.customer.name }}</td>
        <td>{{ invoice.date_created }}</td>
        <td>{{ invoice.payment_status }}</td>
        <td><a href="{% url 'generate_invoice' invoice.id %}">View</a></td>
    </tr>
    {% endfor %}
</table>

What’s Next? 🚀

🔹 Start with PDF & Email Integration → These are the most useful for customers.
🔹 Later, add Payments & Invoice List for a complete billing system.

Would you like help with PDF generation first? 😊

def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Get the latest booking for the vehicle latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first() if not latest_booking: return HttpResponse("No service booked for this vehicle.", status=400) booked_service = latest_booking.service parts = Part.objects.all() # Fetch available parts if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None payment_method = request.POST.get("payment_method") payment_amount = request.POST.get("payment_amount") # Calculate total cost (service + optional part cost) total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) # Create billing record billing = Billing.objects.create( booking=latest_booking, # Link to the booking instead of vehicle/service directly part=selected_part, payment_method=payment_method, payment_amount=payment_amount, total_cost=total_cost # The total cost has already been calculated ) # Redirect to invoice page (add your invoice view logic) return redirect("generate_invoice", billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts }) explain how the above works

Explanation of the `create_billing` Function 🚗💰

This function is responsible for creating a billing record for a vehicle based on its latest booked service. It also allows adding an optional part and selecting a payment method.

🔹 Step-by-Step Breakdown

1️⃣ Get the Vehicle Instance

python
vehicle = get_object_or_404(Vehicle, id=vehicle_id)

This line retrieves the vehicle using the vehicle_id from the URL.
If the vehicle doesn’t exist, it returns a 404 error.

2️⃣ Get the Latest Booking for the Vehicle

python
latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()

Fetches the most recent booking for the given vehicle.
Orders bookings by created_at in descending order ('-created_at' ensures the latest one comes first).
Uses .first() to get only the latest booking.

✅ Why?
Each vehicle can have multiple bookings, but we need the most recent one for billing.

3️⃣ Handle the Case Where There’s No Booking

python
if not latest_booking:
    return HttpResponse("No service booked for this vehicle.", status=400)

If the vehicle has no bookings, the function stops and returns an error message (400 Bad Request).

4️⃣ Retrieve the Booked Service & Available Parts

python
booked_service = latest_booking.service
parts = Part.objects.all()

Retrieves the service from the latest booking.
Fetches all available parts (if the user wants to add a part to the billing).

5️⃣ Handle Form Submission (POST Request)

python
if request.method == "POST":

If the request is a POST request, it means the user has submitted the form to create billing.

➤ Get the Selected Part (If Any)

python
part_id = request.POST.get("part")
selected_part = Part.objects.get(id=part_id) if part_id else None

Tries to get the part ID from the form.
If a part was selected, fetches the Part object from the database.

➤ Get Payment Details

python
payment_method = request.POST.get("payment_method")
payment_amount = request.POST.get("payment_amount")

Retrieves the payment method (e.g., cash, M-Pesa, card) and amount paid from the form.

➤ Calculate Total Cost

python
total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

Base Cost → Comes from the booked service (booked_service.cost).
Part Cost (Optional) → If a part is selected, its cost is added.

✅ Example Calculation:

Service Cost = KSH 5,000
Selected Part = Brake Pads (KSH 2,000)
Total Cost = KSH 7,000

6️⃣ Create the Billing Record

python
billing = Billing.objects.create(
    booking=latest_booking, 
    part=selected_part,
    payment_method=payment_method,
    payment_amount=payment_amount,
    total_cost=total_cost  
)

A new billing record is created in the database.
Links the billing to:
- The latest booking (booking=latest_booking).
- The selected part (if any).
- The payment details and total cost.

7️⃣ Redirect to the Invoice Page

python
return redirect("generate_invoice", billing_id=billing.id)

After successfully creating the billing, the user is redirected to the invoice generation page.

✅ Why?
This allows the user to immediately see the invoice after making the payment.

8️⃣ Render the Billing Form for GET Requests

python
return render(request, "billing/create_billing.html", {
    "vehicle": vehicle,
    "booked_service": booked_service,
    "parts": parts
})

If the request is not POST, the function renders the billing form.
The template (create_billing.html) will display:
- Vehicle details
- Booked service
- Available parts
- Payment method options

🛠 Example Workflow in the System

1️⃣ A customer books a service for their vehicle (e.g., oil change).
2️⃣ The garage staff opens the billing page for the vehicle.
3️⃣ The system fetches the latest booking for that vehicle.
4️⃣ The staff chooses additional parts (if needed) and selects a payment method.
5️⃣ The total cost is calculated automatically.
6️⃣ The staff submits the billing form.
7️⃣ The system creates a billing record and redirects to the invoice page.

🔹 Next Steps?

✅ Make sure the invoice page correctly displays the billing details.
✅ Add a PDF download option for invoices.
✅ Allow emailing the invoice to the customer.

Would you like help with PDF generation or emailing invoices next? 😊

when i create BILLING THE SERVICE AND SERVICE cost remain the same in each user <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } label { font-size: 16px; color: #333; } .info { background: #f0f0f0; padding: 10px; border-radius: 5px; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <div class="info"> <p><strong>Service:</strong> {{ booked_service.name }}</p> <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p> </div> <form method="post"> {% csrf_token %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part" id="part"> <option value="" selected>Select a Part</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <br><br> {% endif %} <label for="payment_method">Payment Method</label> <input type="text" name="payment_method" id="payment_method" required> <label for="payment_amount">Payment Amount</label> <input type="number" name="payment_amount" id="payment_amount" required> <br><br> <button type="submit">Proceed to Invoice</button> </form> </div> </body> </html>

It looks like the service and service cost remain the same for each user when creating billing. This issue likely occurs because your create_billing function always fetches the latest booking instead of filtering by the specific user's booking.

Possible Reasons for the Issue

The latest booking is always used (latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()).
- This means that if multiple users book a service, the most recent one is always chosen, even if it belongs to a different user.
No user-specific filtering
- If multiple users have booked services for the same vehicle, the system always takes the most recent booking, not necessarily the one for the current user.

🔹 Solution: Link Billing to the Logged-in User

To fix this, you should ensure that:

The system filters the latest booking for the logged-in user, not just the latest booking overall.
The booking service is linked to each user separately.

✅ Fix the `create_billing` Function

Modify your query to filter bookings based on the logged-in user:

python
from django.contrib.auth.decorators import login_required

@login_required
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for the logged-in user and the specific vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()

    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service  # Get service from the user's booking
    parts = Part.objects.all()  # Fetch available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = request.POST.get("payment_amount")

        # Calculate total cost (service + optional part cost)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record linked to the user's booking
        billing = Billing.objects.create(
            booking=latest_booking,
            part=selected_part,
            payment_method=payment_method,
            payment_amount=payment_amount,
            total_cost=total_cost
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,
        "parts": parts
    })

🔹 Key Fixes

✅ Filter the Booking model using the logged-in user

python
latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()

Now, it only fetches the latest booking that belongs to the logged-in user instead of any booking for that vehicle.

✅ Added @login_required

python
@login_required

Ensures only authenticated users can create billing.
Redirects to the login page if the user is not logged in.

🔹 Expected Behavior After Fix

Each user sees only their own booked service and cost when creating billing.
If two users book different services for the same vehicle, they get billed separately based on their own booking.
The invoice correctly reflects each user’s service and cost instead of always using the latest booking for that vehicle.

🔹 Next Steps

Would you like to:

Test this fix and confirm if it works?
Improve the invoice system (e.g., add PDF downloads or emailing invoices)?
Let me know! 🚀😊

FieldError at /billing/create_billing/10/ Cannot resolve keyword 'user' into field. Choices are: bookings, created_at, id, service, service_id, vehicle, vehicle_id Request Method: GET Request URL: http://127.0.0.1:8000/billing/create_billing/10/ Django Version: 5.1.7 Exception Type: FieldError Exception Value: Cannot resolve keyword 'user' into field. Choices are: bookings, created_at, id, service, service_id, vehicle, vehicle_id Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\query.py, line 1768, in names_to_path Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Tue, 01 Apr 2025 14:58:22 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\auth\decorators.py, line 60, in _view_wrapper return view_func(request, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 62, in create_billing latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()

The error "Cannot resolve keyword 'user' into field" means that your Booking model does not have a user field. You are trying to filter Booking.objects.filter(vehicle=vehicle, user=request.user), but Django does not recognize user as a field in the Booking model.

🔹 How to Fix It?

Step 1: Check Your Booking Model

Go to your models.py and check if Booking has a field like:

python
user = models.ForeignKey(User, on_delete=models.CASCADE)

If user is missing, you need to add it.

✅ Solution: Add the `user` field

Modify your Booking model:

python
from django.contrib.auth.models import User

class Booking(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)  # Ensure each booking belongs to a user
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)

Then, apply migrations:

sh
python manage.py makemigrations
python manage.py migrate

🔹 Step 2: Filter Using the Correct Field

Once the user field is added, your create_billing function should work correctly:

python
latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()

This ensures that each user sees only their own booking.

🔹 What If You Can't Add `user` to Booking?

If Booking is not linked to users, you need an alternative way to ensure each user gets their own service.
One possible way is to link the vehicle to a user instead:

python
latest_booking = Booking.objects.filter(vehicle__owner=request.user).order_by('-created_at').first()

However, this only works if Vehicle has an owner field:

python
class Vehicle(models.Model):
    owner = models.ForeignKey(User, on_delete=models.CASCADE)  # Ensure each vehicle belongs to a user

🔹 Next Steps

If your Booking model does not have user, add it and run migrations.
If user is already linked to Vehicle, modify the query to use vehicle__owner instead.

Try this fix and let me know if you get stuck! 🚀

Yes, the fix ensures that when a user books an appointment, they are billed only for the service they selected. Here’s how the logic should work after applying the fix:

✅ Correct Workflow

User books an appointment
- A record is created in the Booking table, linking the User, Vehicle, and Service.
Retrieve the latest booking for the user’s vehicle
- The system fetches the most recent booking (latest_booking) for the user's vehicle.
Generate billing for the service booked
- When the user proceeds to create billing, the system gets the exact service they booked.
- The cost is calculated based on the booked service (not a fixed service for all users).
- Any selected additional parts are included in the total cost.
Billing is created per user’s service
- The invoice reflects the correct service and cost for the specific user.

🔹 Final Code Fix for `create_billing`

python
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Fetch the latest booking for the user’s vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service
    parts = Part.objects.all()  # Fetch available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = request.POST.get("payment_amount")

        # Calculate total cost (service + optional part cost)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record
        billing = Billing.objects.create(
            booking=latest_booking,  # Link to the exact booking made by the user
            part=selected_part,
            payment_method=payment_method,
            payment_amount=payment_amount,
            total_cost=total_cost
        )

        # Redirect to the invoice page
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,  # Ensure the correct service is displayed
        "parts": parts
    })

🔹 Key Fixes

✔ Filters bookings based on the logged-in user
✔ Ensures billing is generated only for the service booked
✔ Dynamically fetches service cost per user
✔ Includes optional parts in total cost

Now, each user gets a billing record based on their service appointment. 🚀 Let me know if you need further refinements!

Since you have a CustomUser model in accounts.models, you should use CustomUser instead of Django's default User model.

🔹 Fix for Your `Booking` Model

python
from accounts.models import CustomUser  # Ensure this is imported

class Booking(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE)  # Use CustomUser
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings")
    created_at = models.DateTimeField(auto_now_add=True)  # Timestamp of booking

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

✅ Why Use `CustomUser`?

✔ You already created CustomUser in accounts.models
✔ Avoids conflicts with Django's default User model
✔ Ensures compatibility with your authentication system

🛠 Next Steps

Check accounts.models.CustomUser
- Ensure it extends AbstractUser or AbstractBaseUser.

Run Migrations

sh
python manage.py makemigrations
python manage.py migrate

Update Any Existing Code
- If you were using User, change it to CustomUser where necessary.

Now, Booking will correctly reference the CustomUser model. 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations SystemCheckError: System check identified some issues: ERRORS: billing.Booking.user: (fields.E304) Reverse accessor 'CustomUser.booking_set' for 'billing.Booking.user' clashes with reverse accessor for 'core.Booking.mechanic'. HINT: Add or change a related_name argument to the definition for 'billing.Booking.user' or 'core.Booking.mechanic'. core.Booking.mechanic: (fields.E304) Reverse accessor 'CustomUser.booking_set' for 'core.Booking.mechanic' clashes with reverse accessor for 'billing.Booking.user'. HINT: Add or change a related_name argument to the definition for 'core.Booking.mechanic' or 'billing.Booking.user'. (venv) PS C:\Users\lau\Desktop\Projects\garage_system>

🛠 Fixing the Reverse Accessor Conflict

The error occurs because both billing.Booking.user and core.Booking.mechanic are related to CustomUser, and Django automatically generates the same reverse accessor (booking_set) for both.

🔹 Solution: Use `related_name`

To resolve the conflict, add a related_name attribute to both fields.

✅ Fix in `billing.models.py`

python
class Booking(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings")  # Add related_name
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings")
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

✅ Fix in `core.models.py` (or where `core.Booking.mechanic` is defined)

python
class Booking(models.Model):
    mechanic = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="mechanic_bookings")  # Add related_name
    # Other fields...

🔹 Why This Works

related_name="customer_bookings" → Allows you to access bookings by a customer via user.customer_bookings.all().
related_name="mechanic_bookings" → Allows you to access bookings assigned to a mechanic via user.mechanic_bookings.all().

🛠 Next Steps

Run Migrations Again

sh
python manage.py makemigrations
python manage.py migrate

Update Any Queries Using booking_set
- If you were using user.booking_set.all(), replace it with user.customer_bookings.all() or user.mechanic_bookings.all(), depending on the context.

Now your models should work correctly without conflicts! 🚀

Since you're using settings.AUTH_USER_MODEL for mechanic in core.models.py, you still need to specify a unique related_name to prevent Django from generating the same default booking_set reverse accessor.

✅ Updated `core.models.py`

Modify the Booking model in core.models.py to avoid conflicts:

python
from django.conf import settings
from django.db import models

class Booking(models.Model):
    mechanic = models.ForeignKey(
        settings.AUTH_USER_MODEL, 
        on_delete=models.SET_NULL, 
        null=True, 
        blank=True, 
        related_name="mechanic_bookings"  # Add related_name
    )
    # Other fields...

✅ Updated `billing.models.py`

Modify the Booking model in billing.models.py:

python
from accounts.models import CustomUser

class Booking(models.Model):
    user = models.ForeignKey(
        CustomUser, 
        on_delete=models.CASCADE, 
        related_name="customer_bookings"  # Add related_name
    )
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings")
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

🛠 Next Steps

Run Migrations

sh
python manage.py makemigrations
python manage.py migrate

Update Queries
- If you were using user.booking_set.all(), update it:
  - For customers: user.customer_bookings.all()
  - For mechanics: user.mechanic_bookings.all()

Now, the conflict should be resolved, and your models should work as expected! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations It is impossible to add a non-nullable field 'user' to booking without specifying a default. This is because the database needs something to populate existing rows. Please select a fix: 1) Provide a one-off default now (will be set on all existing rows with a null value for this column) 2) Quit and manually define a default value in models.py. Select an option:

This happens because you've added the user field to the Booking model as non-nullable (null=False), but there are existing rows in the database without a user.

🔧 Solution 1: Provide a Default Value (Temporary Fix)

Since Django is asking for a default value, you can choose option 1 and provide a default user ID that already exists in your database.

Select Option 1
```
vbnet
Select an option: 1
```

Enter an existing user ID (e.g., if your admin user ID is 1, enter 1).

pgsql
Please enter the default value now, or press Enter to abort: 1

Run migrations:
```
sh
python manage.py migrate
```

🔧 Solution 2: Make the `user` Field Nullable (Better Approach)

If you don't want to assign a default user to all past bookings, update billing.models.py like this:

python
class Booking(models.Model):
    user = models.ForeignKey(
        CustomUser, 
        on_delete=models.CASCADE, 
        related_name="customer_bookings", 
        null=True,  # Allow existing records without a user
        blank=True
    )
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings")
    created_at = models.DateTimeField(auto_now_add=True)

Then, run:

sh
python manage.py makemigrations
python manage.py migrate

This ensures older bookings won't break the migration process, and new bookings must have a user assigned. 🚀

Great! Now that you've successfully handled the migration, let's verify everything is working correctly. Here's what to do next:

✅ 1. Test Booking Creation

Try creating a new booking via your form or Django Admin.
Ensure that each booking correctly links a user, vehicle, and service.

✅ 2. Test Billing Generation

Go through the billing process:
1. Book a service for a vehicle.
2. Generate a billing record for that booking.
3. Ensure the correct service and cost appear on the invoice.

If you still see the same service and cost for all users, we might need to double-check how the latest booking is retrieved.

🔍 Potential Issue: `create_billing` Might Be Picking the Wrong Service

In your create_billing function, you are fetching the latest booking using:

python
latest_booking = Booking.objects.filter(vehicle=vehicle).order_by('-created_at').first()

This doesn't check which user made the booking, so it might be picking another user's booking.

🔧 Fix: Ensure the Billing is Linked to the Logged-in User

Modify it like this:

python
latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()

This ensures each user is billed for their own bookings, not someone else's.

✅ 3. Test Invoice Generation

Generate an invoice for a billing entry and ensure:
- The correct service and part details are included.
- The total cost is accurate.
- No duplicate invoices are created.

🔜 Next Steps After Everything Works

Add Payment Processing: Integrate M-Pesa or a dummy payment system.
Enhance the Dashboard: Show pending payments, paid invoices, and billing history per user.
Automate Invoice Number Generation: Ensure each invoice gets a unique, properly formatted number.

Let me know if you hit any issues while testing! 🚀

It should be user=request.user, not CustomUser.

Why?

request.user represents the currently logged-in user.
CustomUser is the user model class, not an instance.

Final Correct Code:

python
latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()

This ensures the latest booking is retrieved for the currently logged-in user, preventing other users' bookings from interfering.

Let me know if you need further clarifications! 🚀

The message "No service booked for this vehicle" means that no booking has been found for the specific vehicle, or there may be an issue with how the booking is being filtered. Here are some things to check:

1. Check if the vehicle has bookings:

Ensure that the vehicle you're trying to check against actually has associated bookings.

2. Check if bookings are correctly related to the vehicle:

In your Booking model, you're linking the vehicle field with a ForeignKey to the Vehicle model. Double-check that you're correctly linking the vehicle and its bookings.

3. Check the `created_at` field:

If the created_at field in your Booking model is being used to sort the bookings (as in order_by('-created_at')), make sure that the timestamp is being set correctly when creating a booking.

4. Inspect your filter query:

The filter Booking.objects.filter(vehicle=vehicle, user=request.user) will only return bookings where both the vehicle and the logged-in user match. If no such booking exists, it will return None. Here are a few debugging steps:

Check if vehicle is passed correctly.
Check if request.user is the correct user for the booking.

Debugging suggestions:

Add some logging or print statements to debug and confirm what's being passed:

python
latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()

if latest_booking:
    print(f"Booking found: {latest_booking}")
else:
    print(f"No booking found for vehicle {vehicle.registration_number} for user {request.user}")

Additional Tip:

If you want to handle the case where no bookings are found, you can show a more informative error message to the user, maybe guiding them to make a booking first.

Let me know if you'd like me to help with specific changes to your logic or queries!

so when i book an appointment am not feeding any vehicle details below is what am feeding {% extends 'core/base.html' %} {% block content %} <div class="container mt-5">  {% if messages %} <div class="alert alert-success text-center" role="alert"> {% for message in messages %} {{ message }} {% endfor %} </div> {% endif %} <div class="row justify-content-center"> <div class="col-lg-6"> <div class="card shadow-lg border-0"> <div class="card-header bg-primary text-white text-center"> <h2 class="fw-bold">📅 Book a Service Appointment</h2> <p class="mb-0">Schedule your garage service in just a few clicks!</p> </div> <div class="card-body"> <form method="POST"> {% csrf_token %} <div class="mb-3"> <label for="name" class="form-label fw-bold">Full Name</label> <input type="text" class="form-control" id="name" name="name" placeholder="Enter your full name" required> </div> <div class="mb-3"> <label for="email" class="form-label fw-bold">Email Address</label> <input type="email" class="form-control" id="email" name="email" placeholder="Enter your email" required> </div> <div class="mb-3"> <label for="phone" class="form-label fw-bold">Phone Number</label> <input type="tel" class="form-control" id="phone" name="phone" placeholder="Enter your phone number" required> </div> <div class="mb-3"> <label for="service" class="form-label fw-bold">Select Service</label> <select class="form-select" id="service" name="service" required> <option value="" disabled selected>-- Choose a Service --</option> <option value="oil_change">🔧 Oil Change</option> <option value="brake_check">🚗 Brake Check</option> <option value="tire_replacement">🚲 Tire Replacement</option> <option value="engine_diagnosis">🛠️ Engine Diagnosis</option> </select> </div> <div class="mb-3"> <label for="date" class="form-label fw-bold">Preferred Date</label> <input type="date" class="form-control" id="date" name="date" required> </div> <div class="mb-3"> <label for="message" class="form-label fw-bold">Additional Notes</label> <textarea class="form-control" id="message" name="message" rows="3" placeholder="Any special requests?"></textarea> </div> <button type="submit" class="btn btn-primary w-100 py-2 fw-bold"> ✅ Confirm Booking </button> </form> </div> <div class="card-footer text-center text-muted"> <small>We will confirm your booking via email or phone.</small> </div> </div> </div> </div> </div> {% endblock %}

In the form you're currently submitting for booking an appointment, you're not asking for any vehicle details. Since your system is designed to associate a booking with a specific vehicle, you need to add the vehicle selection (or details) to the form.

Here’s how you can adjust the form to include a vehicle selection so that the booking can be associated with a specific vehicle:

Suggested Changes:

Include a dropdown to select a vehicle: If a customer has multiple vehicles registered, you should provide a way for them to select a vehicle from the list.
Option to create a new vehicle: If this is their first booking and they don't have a vehicle associated, you could include an option to add a new vehicle or ask them to choose from the existing vehicles.

Here's an updated version of the form that includes a vehicle selection:

Updated Form:

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">

    <!-- Success Message -->
    {% if messages %}
    <div class="alert alert-success text-center" role="alert">
        {% for message in messages %}
            {{ message }}
        {% endfor %}
    </div>
    {% endif %}

    <div class="row justify-content-center">
        <div class="col-lg-6">
            <div class="card shadow-lg border-0">
                <div class="card-header bg-primary text-white text-center">
                    <h2 class="fw-bold">📅 Book a Service Appointment</h2>
                    <p class="mb-0">Schedule your garage service in just a few clicks!</p>
                </div>
                <div class="card-body">
                    <form method="POST">
                        {% csrf_token %}

                        <div class="mb-3">
                            <label for="name" class="form-label fw-bold">Full Name</label>
                            <input type="text" class="form-control" id="name" name="name" placeholder="Enter your full name" required>
                        </div>

                        <div class="mb-3">
                            <label for="email" class="form-label fw-bold">Email Address</label>
                            <input type="email" class="form-control" id="email" name="email" placeholder="Enter your email" required>
                        </div>

                        <div class="mb-3">
                            <label for="phone" class="form-label fw-bold">Phone Number</label>
                            <input type="tel" class="form-control" id="phone" name="phone" placeholder="Enter your phone number" required>
                        </div>

                        <!-- Vehicle selection -->
                        <div class="mb-3">
                            <label for="vehicle" class="form-label fw-bold">Select Vehicle</label>
                            <select class="form-select" id="vehicle" name="vehicle" required>
                                <option value="" disabled selected>-- Choose a Vehicle --</option>
                                {% for vehicle in vehicles %}
                                    <option value="{{ vehicle.id }}">{{ vehicle.make }} {{ vehicle.model }} - {{ vehicle.registration_number }}</option>
                                {% endfor %}
                            </select>
                        </div>

                        <div class="mb-3">
                            <label for="service" class="form-label fw-bold">Select Service</label>
                            <select class="form-select" id="service" name="service" required>
                                <option value="" disabled selected>-- Choose a Service --</option>
                                <option value="oil_change">🔧 Oil Change</option>
                                <option value="brake_check">🚗 Brake Check</option>
                                <option value="tire_replacement">&#128690; Tire Replacement</option>
                                <option value="engine_diagnosis">🛠️ Engine Diagnosis</option>
                            </select>
                        </div>

                        <div class="mb-3">
                            <label for="date" class="form-label fw-bold">Preferred Date</label>
                            <input type="date" class="form-control" id="date" name="date" required>
                        </div>

                        <div class="mb-3">
                            <label for="message" class="form-label fw-bold">Additional Notes</label>
                            <textarea class="form-control" id="message" name="message" rows="3" placeholder="Any special requests?"></textarea>
                        </div>

                        <button type="submit" class="btn btn-primary w-100 py-2 fw-bold">
                            ✅ Confirm Booking
                        </button>
                    </form>
                </div>
                <div class="card-footer text-center text-muted">
                    <small>We will confirm your booking via email or phone.</small>
                </div>
            </div>
        </div>
    </div>
</div>
{% endblock %}

Notes:

Vehicle Selection Dropdown:
- I added a <select> input for the user to choose a vehicle. This pulls from the vehicles list, which you should pass to the template.

Pass vehicles to the Template: In your view function, you should pass the vehicles associated with the logged-in user:

python
vehicles = Vehicle.objects.filter(customer__user=request.user)
return render(request, 'your_template.html', {'vehicles': vehicles})

Handling "No Vehicle" Case: If the user doesn’t have any vehicles, you could either show a message asking them to add a vehicle, or provide a link to a form where they can add one.

Next Steps:

Update the view: Modify the view that handles the booking form to ensure the vehicle is associated with the booking.
Update the Booking model: Ensure you're associating the correct vehicle and user when creating the booking.

If you need help with the view or model adjustments, feel free to ask!

The error "Vehicle with this Registration number already exists" is likely occurring because your Vehicle model has the registration_number field set to be unique, as seen in this part of your model:

python
registration_number = models.CharField(max_length=20, unique=True)

This ensures that no two vehicles can have the same registration number in your system. So, when a user tries to add a new vehicle with a registration number that already exists, Django will raise a ValidationError.

How to Fix This:

There are a few ways you can handle this situation:

1. Prevent Duplicate Registration Numbers During Form Submission:

You can ensure that the user is notified when they try to add a vehicle with a registration number that already exists. This can be handled within your form view.

Example: In your view, when processing the form data, check if the registration number already exists before saving the new vehicle:

python
from django.core.exceptions import ValidationError

def add_vehicle(request):
    if request.method == 'POST':
        registration_number = request.POST.get('registration_number')
        # Check if vehicle with the same registration number exists
        if Vehicle.objects.filter(registration_number=registration_number).exists():
            raise ValidationError("Vehicle with this Registration number already exists.")

        # If no duplicate, save the vehicle
        vehicle = Vehicle.objects.create(
            registration_number=registration_number,
            # Add other form fields as needed
        )
        # Continue processing (e.g., redirect to success page)

2. Provide a Friendly Message to the User:

Instead of throwing a server error, you can catch the IntegrityError or ValidationError and provide a user-friendly message, so they know the registration number is already taken.

Example with a user-friendly message:

python
from django.contrib import messages
from django.db import IntegrityError

def add_vehicle(request):
    if request.method == 'POST':
        try:
            registration_number = request.POST.get('registration_number')
            vehicle = Vehicle.objects.create(
                registration_number=registration_number,
                # other fields...
            )
            messages.success(request, "Vehicle added successfully!")
            return redirect('success_url')  # Replace with your desired redirect URL
        except IntegrityError:
            messages.error(request, "Vehicle with this Registration number already exists.")
            return render(request, 'add_vehicle_form.html')

3. Allow Updating an Existing Vehicle (Optional):

If you want to allow users to update a vehicle rather than adding a duplicate, you can modify your view to check if the vehicle already exists based on the registration number and then update it instead of creating a new one.

For example:

python
def add_or_update_vehicle(request):
    registration_number = request.POST.get('registration_number')
    vehicle = Vehicle.objects.filter(registration_number=registration_number).first()

    if vehicle:
        # Update vehicle if it already exists
        vehicle.make = request.POST.get('make')
        vehicle.model = request.POST.get('model')
        vehicle.save()
        messages.success(request, "Vehicle updated successfully!")
    else:
        # Create a new vehicle
        vehicle = Vehicle.objects.create(
            registration_number=registration_number,
            make=request.POST.get('make'),
            model=request.POST.get('model'),
        )
        messages.success(request, "Vehicle added successfully!")
    
    return redirect('success_url')  # Replace with your desired redirect URL

Next Steps:

Check Vehicle Before Saving: Always check for duplicate registration numbers when saving a new vehicle.
Improve User Experience: Show a message to the user if the registration number already exists, instead of raising an unhandled error.

Would you like help with integrating this into your code?

Yes, you can provide information about the vehicle before booking, and instead of selecting from a pre-defined list, you can directly populate the vehicle details.

Here’s how you can modify your form and view to handle this scenario:

1. Vehicle Info Before Booking:

You can add a vehicle selection form or pre-fill vehicle information when the user is booking a service. The idea is to either:

Allow the user to select an existing vehicle from their profile.
Allow them to add a new vehicle if none exists.

Steps to Implement:

Modify the View to Pre-Fill Vehicle Information:

In your booking view, you should first check if the user has any saved vehicles. If they do, you can pre-populate the vehicle information for them.

Example View:

python
from django.shortcuts import render, redirect
from .models import Vehicle, Service, Booking
from django.contrib import messages

def book_service(request):
    user = request.user
    services = Service.objects.all()  # You can filter services if needed

    # If the user has vehicles, let them choose one
    vehicles = Vehicle.objects.filter(customer__user=user)

    if request.method == "POST":
        vehicle_id = request.POST.get('vehicle')  # Vehicle ID from the form
        service_id = request.POST.get('service')  # Service ID from the form
        vehicle = Vehicle.objects.get(id=vehicle_id)
        service = Service.objects.get(id=service_id)

        # Create the booking
        booking = Booking.objects.create(
            user=user,
            vehicle=vehicle,
            service=service
        )

        messages.success(request, "Service booked successfully!")
        return redirect('success_url')  # Replace with your desired redirect URL

    return render(request, 'booking_form.html', {
        'services': services,
        'vehicles': vehicles,
    })

Modify the HTML Form to Display Vehicle Information:

Now that the view is passing the vehicles and services to the template, you can display them in the form for the user to select.

Updated HTML Template:

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">

    {% if messages %}
    <div class="alert alert-success text-center" role="alert">
        {% for message in messages %}
            {{ message }}
        {% endfor %}
    </div>
    {% endif %}

    <div class="row justify-content-center">
        <div class="col-lg-6">
            <div class="card shadow-lg border-0">
                <div class="card-header bg-primary text-white text-center">
                    <h2 class="fw-bold">📅 Book a Service Appointment</h2>
                    <p class="mb-0">Schedule your garage service in just a few clicks!</p>
                </div>
                <div class="card-body">
                    <form method="POST">
                        {% csrf_token %}

                        <div class="mb-3">
                            <label for="vehicle" class="form-label fw-bold">Select Vehicle</label>
                            <select class="form-select" id="vehicle" name="vehicle" required>
                                <option value="" disabled selected>-- Choose a Vehicle --</option>
                                {% for vehicle in vehicles %}
                                    <option value="{{ vehicle.id }}">
                                        {{ vehicle.make }} {{ vehicle.model }} - {{ vehicle.registration_number }}
                                    </option>
                                {% endfor %}
                            </select>
                        </div>

                        <div class="mb-3">
                            <label for="service" class="form-label fw-bold">Select Service</label>
                            <select class="form-select" id="service" name="service" required>
                                <option value="" disabled selected>-- Choose a Service --</option>
                                {% for service in services %}
                                    <option value="{{ service.id }}">{{ service.name }}</option>
                                {% endfor %}
                            </select>
                        </div>

                        <div class="mb-3">
                            <label for="date" class="form-label fw-bold">Preferred Date</label>
                            <input type="date" class="form-control" id="date" name="date" required>
                        </div>

                        <div class="mb-3">
                            <label for="message" class="form-label fw-bold">Additional Notes</label>
                            <textarea class="form-control" id="message" name="message" rows="3" placeholder="Any special requests?"></textarea>
                        </div>

                        <button type="submit" class="btn btn-primary w-100 py-2 fw-bold">
                            ✅ Confirm Booking
                        </button>
                    </form>
                </div>
                <div class="card-footer text-center text-muted">
                    <small>We will confirm your booking via email or phone.</small>
                </div>
            </div>
        </div>
    </div>
</div>
{% endblock %}

3. Handling Case When User Has No Vehicle:

If a user doesn't have a vehicle, you can allow them to add one before proceeding to the booking. You can provide a link to add a new vehicle in the form or redirect them to a vehicle addition page.

For example, add this snippet in your template if there are no vehicles:

html
{% if not vehicles %}
<p>You don't have any vehicles added yet. <a href="{% url 'add_vehicle' %}">Add a new vehicle</a> before booking a service.</p>
{% endif %}

4. Add Vehicle View (Optional):

You might also want to provide a form to add a new vehicle. This form could be something like:

html
<form method="POST">
    {% csrf_token %}
    <div class="mb-3">
        <label for="make" class="form-label">Vehicle Make</label>
        <input type="text" class="form-control" id="make" name="make" required>
    </div>
    <div class="mb-3">
        <label for="model" class="form-label">Vehicle Model</label>
        <input type="text" class="form-control" id="model" name="model" required>
    </div>
    <div class="mb-3">
        <label for="registration_number" class="form-label">Registration Number</label>
        <input type="text" class="form-control" id="registration_number" name="registration_number" required>
    </div>
    <button type="submit" class="btn btn-primary">Add Vehicle</button>
</form>

In your views.py, you can handle adding a vehicle like this:

python
def add_vehicle(request):
    if request.method == 'POST':
        make = request.POST.get('make')
        model = request.POST.get('model')
        registration_number = request.POST.get('registration_number')

        # Check if vehicle with the same registration number exists
        if Vehicle.objects.filter(registration_number=registration_number).exists():
            messages.error(request, "Vehicle with this registration number already exists.")
            return redirect('add_vehicle')  # Replace with your URL name

        # Create new vehicle
        Vehicle.objects.create(
            customer=request.user.customer,  # Assuming the user has a Customer profile
            make=make,
            model=model,
            registration_number=registration_number
        )
        messages.success(request, "Vehicle added successfully!")
        return redirect('book_service')  # Redirect to booking page

Summary of Changes:

View: Modify the booking view to pass existing vehicles and services to the template.
Form: Update the form to let the user select their vehicle from their profile.
Add Vehicle: Optionally, allow users to add a new vehicle if they don't have one.

Let me know if you need further clarification on any of these steps!

no i mean {% extends 'core/base.html' %} {% block content %} <div class="container mt-5">  {% if messages %} <div class="alert alert-success text-center" role="alert"> {% for message in messages %} {{ message }} {% endfor %} </div> {% endif %} <div class="row justify-content-center"> <div class="col-lg-6"> <div class="card shadow-lg border-0"> <div class="card-header bg-primary text-white text-center"> <h2 class="fw-bold">📅 Book a Service Appointment</h2> <p class="mb-0">Schedule your garage service in just a few clicks!</p> </div> <div class="card-body"> <form method="POST"> {% csrf_token %} <div class="mb-3"> <label for="name" class="form-label fw-bold">Full Name</label> <input type="text" class="form-control" id="name" name="name" placeholder="Enter your full name" required> </div> <div class="mb-3"> <label for="email" class="form-label fw-bold">Email Address</label> <input type="email" class="form-control" id="email" name="email" placeholder="Enter your email" required> </div> <div class="mb-3"> <label for="phone" class="form-label fw-bold">Phone Number</label> <input type="tel" class="form-control" id="phone" name="phone" placeholder="Enter your phone number" required> </div>  <div class="mb-3"> <label for="vehicle" class="form-label fw-bold">Select Vehicle</label> <select class="form-select" id="vehicle" name="vehicle" required> <option value="" disabled selected>-- Choose a Vehicle --</option> {% for vehicle in vehicles %} <option value="{{ vehicle.id }}">{{ vehicle.make }} {{ vehicle.model }} - {{ vehicle.registration_number }}</option> {% endfor %} </select> </div> <div class="mb-3"> <label for="service" class="form-label fw-bold">Select Service</label> <select class="form-select" id="service" name="service" required> <option value="" disabled selected>-- Choose a Service --</option> <option value="oil_change">🔧 Oil Change</option> <option value="brake_check">🚗 Brake Check</option> <option value="tire_replacement">🚲 Tire Replacement</option> <option value="engine_diagnosis">🛠️ Engine Diagnosis</option> </select> </div> <div class="mb-3"> <label for="date" class="form-label fw-bold">Preferred Date</label> <input type="date" class="form-control" id="date" name="date" required> </div> <div class="mb-3"> <label for="message" class="form-label fw-bold">Additional Notes</label> <textarea class="form-control" id="message" name="message" rows="3" placeholder="Any special requests?"></textarea> </div> <button type="submit" class="btn btn-primary w-100 py-2 fw-bold"> ✅ Confirm Booking </button> </form> </div> <div class="card-footer text-center text-muted"> <small>We will confirm your booking via email or phone.</small> </div> </div> </div> </div> </div> {% endblock %} instead of select i just provide the vehicle info in the form directly

Ah, I see! You want to directly allow users to input their vehicle information in the booking form, instead of selecting from an existing list of vehicles. Here’s how you can modify the form to take in vehicle details (like make, model, and registration number) directly:

Steps to Modify the Form:

Add Input Fields for Vehicle Information:

Instead of a select dropdown, you can create input fields for the user to enter the vehicle’s make, model, and registration number.

Updated HTML Form with Direct Vehicle Information Input:

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">

    <!-- Success Message -->
    {% if messages %}
    <div class="alert alert-success text-center" role="alert">
        {% for message in messages %}
            {{ message }}
        {% endfor %}
    </div>
    {% endif %}

    <div class="row justify-content-center">
        <div class="col-lg-6">
            <div class="card shadow-lg border-0">
                <div class="card-header bg-primary text-white text-center">
                    <h2 class="fw-bold">📅 Book a Service Appointment</h2>
                    <p class="mb-0">Schedule your garage service in just a few clicks!</p>
                </div>
                <div class="card-body">
                    <form method="POST">
                        {% csrf_token %}

                        <div class="mb-3">
                            <label for="name" class="form-label fw-bold">Full Name</label>
                            <input type="text" class="form-control" id="name" name="name" placeholder="Enter your full name" required>
                        </div>

                        <div class="mb-3">
                            <label for="email" class="form-label fw-bold">Email Address</label>
                            <input type="email" class="form-control" id="email" name="email" placeholder="Enter your email" required>
                        </div>

                        <div class="mb-3">
                            <label for="phone" class="form-label fw-bold">Phone Number</label>
                            <input type="tel" class="form-control" id="phone" name="phone" placeholder="Enter your phone number" required>
                        </div>

                        <!-- Vehicle Information (Direct input fields) -->
                        <div class="mb-3">
                            <label for="vehicle_make" class="form-label fw-bold">Vehicle Make</label>
                            <input type="text" class="form-control" id="vehicle_make" name="vehicle_make" placeholder="Enter vehicle make" required>
                        </div>

                        <div class="mb-3">
                            <label for="vehicle_model" class="form-label fw-bold">Vehicle Model</label>
                            <input type="text" class="form-control" id="vehicle_model" name="vehicle_model" placeholder="Enter vehicle model" required>
                        </div>

                        <div class="mb-3">
                            <label for="vehicle_registration_number" class="form-label fw-bold">Vehicle Registration Number</label>
                            <input type="text" class="form-control" id="vehicle_registration_number" name="vehicle_registration_number" placeholder="Enter vehicle registration number" required>
                        </div>

                        <div class="mb-3">
                            <label for="service" class="form-label fw-bold">Select Service</label>
                            <select class="form-select" id="service" name="service" required>
                                <option value="" disabled selected>-- Choose a Service --</option>
                                <option value="oil_change">🔧 Oil Change</option>
                                <option value="brake_check">🚗 Brake Check</option>
                                <option value="tire_replacement">&#128690; Tire Replacement</option>
                                <option value="engine_diagnosis">🛠️ Engine Diagnosis</option>
                            </select>
                        </div>

                        <div class="mb-3">
                            <label for="date" class="form-label fw-bold">Preferred Date</label>
                            <input type="date" class="form-control" id="date" name="date" required>
                        </div>

                        <div class="mb-3">
                            <label for="message" class="form-label fw-bold">Additional Notes</label>
                            <textarea class="form-control" id="message" name="message" rows="3" placeholder="Any special requests?"></textarea>
                        </div>

                        <button type="submit" class="btn btn-primary w-100 py-2 fw-bold">
                            ✅ Confirm Booking
                        </button>
                    </form>
                </div>
                <div class="card-footer text-center text-muted">
                    <small>We will confirm your booking via email or phone.</small>
                </div>
            </div>
        </div>
    </div>
</div>
{% endblock %}

2. Modify the View to Handle Direct Vehicle Input:

Now that you’re collecting the vehicle details directly in the form, your view needs to handle creating the vehicle if it doesn't already exist.

You’ll need to update your view to create or retrieve the vehicle before booking the service:

python
from django.shortcuts import render, redirect
from django.contrib import messages
from .models import Vehicle, Service, Booking

def book_service(request):
    if request.method == "POST":
        # Get vehicle details from form input
        vehicle_make = request.POST.get('vehicle_make')
        vehicle_model = request.POST.get('vehicle_model')
        vehicle_registration_number = request.POST.get('vehicle_registration_number')

        # Check if the vehicle with the same registration number exists (Optional)
        vehicle, created = Vehicle.objects.get_or_create(
            registration_number=vehicle_registration_number,
            defaults={'make': vehicle_make, 'model': vehicle_model, 'customer': request.user.customer}
        )

        # Get selected service from form
        service_id = request.POST.get('service')
        service = Service.objects.get(id=service_id)

        # Create a booking
        booking = Booking.objects.create(
            user=request.user,
            vehicle=vehicle,
            service=service,
            date=request.POST.get('date'),
            message=request.POST.get('message')
        )

        messages.success(request, "Service booked successfully!")
        return redirect('booking_success')  # Replace with your redirect URL

    services = Service.objects.all()
    return render(request, 'booking_form.html', {'services': services})

Explanation of Changes:

Form Changes:
- I replaced the vehicle selection dropdown with input fields for the vehicle make, model, and registration number.
View Changes:
- When the form is submitted, the view checks whether the vehicle with the given registration number already exists.
- If it doesn't exist, the view creates a new vehicle with the provided details.
- The booking is then created with the vehicle and service information.

3. Optional: Validation for Duplicate Vehicles (Optional):

If you want to ensure that the vehicle registration number is unique for each user, you can add validation in the view:

python
# Check if the vehicle with the same registration number already exists for this user
existing_vehicle = Vehicle.objects.filter(
    registration_number=vehicle_registration_number,
    customer=request.user.customer
).first()

if existing_vehicle:
    messages.error(request, "A vehicle with this registration number already exists for your account.")
    return redirect('book_service')  # Replace with your desired URL

Summary:

Now, the user will directly enter the vehicle information (make, model, registration number) instead of selecting from a list. The view will handle creating or retrieving the vehicle and associating it with the service booking.

Let me know if you need further adjustments or clarification!

Got it! If only the vehicle registration number is required to be filled out in the booking form and not the make and model, here's how you can modify the form to just require the registration number:

Updated HTML Form (Only Vehicle Registration Number is Required):

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">

    <!-- Success Message -->
    {% if messages %}
    <div class="alert alert-success text-center" role="alert">
        {% for message in messages %}
            {{ message }}
        {% endfor %}
    </div>
    {% endif %}

    <div class="row justify-content-center">
        <div class="col-lg-6">
            <div class="card shadow-lg border-0">
                <div class="card-header bg-primary text-white text-center">
                    <h2 class="fw-bold">📅 Book a Service Appointment</h2>
                    <p class="mb-0">Schedule your garage service in just a few clicks!</p>
                </div>
                <div class="card-body">
                    <form method="POST">
                        {% csrf_token %}

                        <div class="mb-3">
                            <label for="name" class="form-label fw-bold">Full Name</label>
                            <input type="text" class="form-control" id="name" name="name" placeholder="Enter your full name" required>
                        </div>

                        <div class="mb-3">
                            <label for="email" class="form-label fw-bold">Email Address</label>
                            <input type="email" class="form-control" id="email" name="email" placeholder="Enter your email" required>
                        </div>

                        <div class="mb-3">
                            <label for="phone" class="form-label fw-bold">Phone Number</label>
                            <input type="tel" class="form-control" id="phone" name="phone" placeholder="Enter your phone number" required>
                        </div>

                        <!-- Vehicle Registration Number (only field required for the vehicle) -->
                        <div class="mb-3">
                            <label for="vehicle_registration_number" class="form-label fw-bold">Vehicle Registration Number</label>
                            <input type="text" class="form-control" id="vehicle_registration_number" name="vehicle_registration_number" placeholder="Enter vehicle registration number" required>
                        </div>

                        <div class="mb-3">
                            <label for="service" class="form-label fw-bold">Select Service</label>
                            <select class="form-select" id="service" name="service" required>
                                <option value="" disabled selected>-- Choose a Service --</option>
                                <option value="oil_change">🔧 Oil Change</option>
                                <option value="brake_check">🚗 Brake Check</option>
                                <option value="tire_replacement">&#128690; Tire Replacement</option>
                                <option value="engine_diagnosis">🛠️ Engine Diagnosis</option>
                            </select>
                        </div>

                        <div class="mb-3">
                            <label for="date" class="form-label fw-bold">Preferred Date</label>
                            <input type="date" class="form-control" id="date" name="date" required>
                        </div>

                        <div class="mb-3">
                            <label for="message" class="form-label fw-bold">Additional Notes</label>
                            <textarea class="form-control" id="message" name="message" rows="3" placeholder="Any special requests?"></textarea>
                        </div>

                        <button type="submit" class="btn btn-primary w-100 py-2 fw-bold">
                            ✅ Confirm Booking
                        </button>
                    </form>
                </div>
                <div class="card-footer text-center text-muted">
                    <small>We will confirm your booking via email or phone.</small>
                </div>
            </div>
        </div>
    </div>
</div>
{% endblock %}

View Update to Handle Only Vehicle Registration Number:

In the view, you will handle the registration number by checking if the vehicle with that registration number already exists. If it doesn't exist, it will create a new vehicle with just the registration number and proceed to create the booking.

Here’s how to update the view:

python
from django.shortcuts import render, redirect
from django.contrib import messages
from .models import Vehicle, Service, Booking

def book_service(request):
    if request.method == "POST":
        # Get vehicle registration number from form input
        vehicle_registration_number = request.POST.get('vehicle_registration_number')

        # Check if the vehicle with the same registration number exists
        vehicle, created = Vehicle.objects.get_or_create(
            registration_number=vehicle_registration_number,
            defaults={'customer': request.user.customer}
        )

        # Get selected service from form
        service_id = request.POST.get('service')
        service = Service.objects.get(id=service_id)

        # Create a booking
        booking = Booking.objects.create(
            user=request.user,
            vehicle=vehicle,
            service=service,
            date=request.POST.get('date'),
            message=request.POST.get('message')
        )

        messages.success(request, "Service booked successfully!")
        return redirect('booking_success')  # Replace with your redirect URL

    services = Service.objects.all()
    return render(request, 'booking_form.html', {'services': services})

Key Changes:

Form Changes:
- Only the vehicle registration number is required to be input by the user.
View Changes:
- In the view, get_or_create is used to check if the vehicle with the given registration number already exists. If not, it will create a new Vehicle object using just the registration number.
- The booking is then created with the selected service and other form details.

Summary:

The user will only need to enter the vehicle registration number.
The system will automatically handle the vehicle creation if the registration number doesn’t already exist.
The form submits the booking with just the necessary details, and the backend will take care of the rest.

Let me know if you need any further adjustments!

def booking_view(request): if request.method == "POST": form = BookingForm(request.POST) if form.is_valid(): form.save() messages.success(request, "✅ Your booking has been successfully submitted!") return redirect('booking') # Redirect to the same page after success else: form = BookingForm() return render(request, 'core/booking.html', {'form': form}) here is the booking view adjust

To adjust your existing booking_view to handle the vehicle registration number and automatically create a new vehicle if it doesn't exist, you can modify it as follows. The goal is to ensure that when the form is submitted, the vehicle is either selected (if it exists) or created (if it doesn't exist).

Adjusted Booking View:

python
from django.shortcuts import render, redirect
from django.contrib import messages
from .models import Vehicle, Service, Booking
from .forms import BookingForm  # Assuming you have a form class for the booking

def booking_view(request):
    if request.method == "POST":
        form = BookingForm(request.POST)
        
        # Check if the form is valid
        if form.is_valid():
            # Get vehicle registration number from the form
            vehicle_registration_number = form.cleaned_data['vehicle_registration_number']
            
            # Check if the vehicle with the provided registration number exists, or create a new one
            vehicle, created = Vehicle.objects.get_or_create(
                registration_number=vehicle_registration_number,
                defaults={'customer': request.user.customer}  # Assuming the user has a related customer object
            )
            
            # Get the service selected in the form
            service = form.cleaned_data['service']
            
            # Create a booking instance
            booking = form.save(commit=False)
            booking.vehicle = vehicle  # Attach the vehicle to the booking
            booking.user = request.user  # Attach the logged-in user
            booking.save()  # Save the booking instance
            
            # Success message
            messages.success(request, "✅ Your booking has been successfully submitted!")
            return redirect('booking')  # Redirect to the same page after success
    else:
        form = BookingForm()  # Instantiate the form when it's a GET request
    
    return render(request, 'core/booking.html', {'form': form})

Key Changes in the View:

Vehicle Handling:
- Before saving the form, the vehicle is checked via get_or_create using the vehicle registration number from the form. If the vehicle exists, it uses the existing one; if not, it creates a new one.
- The customer is attached to the vehicle using the logged-in user's related customer object.
Service and Booking:
- After ensuring that the vehicle exists or is created, the service and other form data are processed, and the booking is saved.
- The booking is linked to the current logged-in user and the selected vehicle.
Redirect & Success Message:
- After successfully creating the booking, a success message is shown and the user is redirected back to the booking page.

Ensure BookingForm Is Correct:

Make sure that your BookingForm includes a field for the vehicle registration number. For example:

python
from django import forms
from .models import Booking

class BookingForm(forms.ModelForm):
    class Meta:
        model = Booking
        fields = ['vehicle_registration_number', 'service', 'date', 'message']
        
    vehicle_registration_number = forms.CharField(max_length=20)

In the Template:

The form should display the vehicle registration number input field. Here's a quick reminder of how the form could look:

html
<form method="POST">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit" class="btn btn-primary">Book Service</button>
</form>

Summary:

When the user submits the form, the view will first check if the vehicle with the provided registration number exists. If it does, it will use that vehicle; if not, it will create a new vehicle with that registration number.
The rest of the booking process follows, where the service and user are associated with the booking.

This should address your requirement of handling the vehicle registration number correctly while creating a booking. Let me know if you need any further adjustments!

from django.conf import settings from django.db import models class Booking(models.Model): SERVICE_CHOICES = [ ('oil_change', 'Oil Change'), ('brake_check', 'Brake Check'), ('tire_replacement', 'Tire Replacement'), ('engine_diagnosis', 'Engine Diagnosis'), ] STATUS_CHOICES = [ ('pending', 'Pending'), ('approved', 'Approved'), ('in_progress', 'In Progress'), ('completed', 'Completed'), ('cancelled', 'Cancelled'), ] name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) service = models.CharField(max_length=50, choices=SERVICE_CHOICES) date = models.DateField() message = models.TextField(blank=True, null=True) status = models.CharField(max_length=11, choices=STATUS_CHOICES, default='pending') mechanic = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL,null=True, blank=True, related_name="mechanic_bookings") created_at = models.DateTimeField(auto_now_add=True) def __str__(self): return f"{self.name} - {self.service} on {self.date}" class Service(models.Model): name = models.CharField(max_length=100, unique=True) description = models.TextField(blank=True, null=True) estimated_time = models.DurationField(help_text="Estimated completion time") price = models.DecimalField(max_digits=10, decimal_places=2) created_at = models.DateTimeField(auto_now_add=True) def __str__(self): return self.name does the models match with the above functionality

Your models look mostly good, but there are a couple of things to consider in relation to the functionality you want to implement (booking a service, assigning a mechanic, handling service options, etc.).

1. The `Booking` Model:

What's good:

You have service as a choice field which allows users to select different service types.
The status field captures the booking's state (e.g., pending, approved, completed, etc.), which is great for workflow management.
The mechanic field is a foreign key to settings.AUTH_USER_MODEL (which means it references the User model). This is fine if the mechanic is a user who can be assigned to a booking.

Areas to review:

Vehicle Information: Based on your initial functionality, you mentioned that each booking is linked to a vehicle, but there’s no vehicle field in this model. If you're associating the booking with a particular vehicle, you need to add that field (likely a foreign key to the Vehicle model).
Customer Information: Since you have a name, email, and phone directly in the booking, it might be better to link the booking to a Customer model. This would allow you to capture the customer's info more explicitly and avoid redundancy.

Suggested Adjustments for the `Booking` Model:

python
class Booking(models.Model):
    SERVICE_CHOICES = [
        ('oil_change', 'Oil Change'),
        ('brake_check', 'Brake Check'),
        ('tire_replacement', 'Tire Replacement'),
        ('engine_diagnosis', 'Engine Diagnosis'),
    ]

    STATUS_CHOICES = [
        ('pending', 'Pending'),
        ('approved', 'Approved'),
        ('in_progress', 'In Progress'),
        ('completed', 'Completed'),
        ('cancelled', 'Cancelled'),
    ]

    customer = models.ForeignKey('Customer', on_delete=models.CASCADE)  # Link booking to a customer
    vehicle = models.ForeignKey('Vehicle', on_delete=models.CASCADE)  # Link booking to a vehicle
    service = models.CharField(max_length=50, choices=SERVICE_CHOICES)
    date = models.DateField()
    message = models.TextField(blank=True, null=True)
    status = models.CharField(max_length=11, choices=STATUS_CHOICES, default='pending')

    mechanic = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name="mechanic_bookings")
    
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.customer.name} - {self.service} on {self.date}"

2. The `Service` Model:

What's good:

The name, description, and price fields in the Service model are great for defining the types of services that are available to be booked.
The estimated time field (as a DurationField) helps to track how long the service will take.

Areas to review:

It might be better to have a ForeignKey relationship from the Service model to the Booking model (instead of embedding the service name directly in Booking), but your Booking model already handles this with a CharField. This is fine unless you want to change it to reference the Service model directly (so each booking references a service object).

3. Vehicle and Customer Models:

It looks like you're handling vehicles and customers elsewhere (in separate models). If that's the case, ensure these relationships are properly established:

Vehicle Model: You’ll want to have a ForeignKey for the customer in the Vehicle model, and the Booking model will then reference the Vehicle.
Customer Model: Your Booking model can reference the Customer model to keep track of which customer booked the service.

Summary of Adjustments:

Add a vehicle field to the Booking model to link each booking to a vehicle.
Consider using a Customer foreign key in the Booking model (if you want more structured customer information).
If you want to link a booking directly to a Service object instead of a CharField, consider referencing the Service model via a ForeignKey.

Let me know if you need further adjustments!

Let's proceed step by step to make the necessary adjustments.

Step 1: Modify the `Booking` Model to Link It to a `Customer` and `Vehicle`

The first thing we’ll do is add the vehicle and customer relationships in the Booking model to track which vehicle and customer each booking belongs to.

Here's the first adjustment we’ll make to the Booking model:

python
from django.db import models
from django.conf import settings

class Booking(models.Model):
    SERVICE_CHOICES = [
        ('oil_change', 'Oil Change'),
        ('brake_check', 'Brake Check'),
        ('tire_replacement', 'Tire Replacement'),
        ('engine_diagnosis', 'Engine Diagnosis'),
    ]

    STATUS_CHOICES = [
        ('pending', 'Pending'),
        ('approved', 'Approved'),
        ('in_progress', 'In Progress'),
        ('completed', 'Completed'),
        ('cancelled', 'Cancelled'),
    ]

    # Add a reference to Customer
    customer = models.ForeignKey('Customer', on_delete=models.CASCADE)  # Link booking to a customer

    # Add a reference to Vehicle
    vehicle = models.ForeignKey('Vehicle', on_delete=models.CASCADE)  # Link booking to a vehicle

    service = models.CharField(max_length=50, choices=SERVICE_CHOICES)
    date = models.DateField()
    message = models.TextField(blank=True, null=True)
    status = models.CharField(max_length=11, choices=STATUS_CHOICES, default='pending')

    mechanic = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name="mechanic_bookings")
    
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.customer.name} - {self.service} on {self.date}"

Explanation:

customer: A ForeignKey relationship that links a booking to a Customer. We assume that you have a Customer model, so we refer to it as 'Customer' in the string format for Django to resolve it.
vehicle: A ForeignKey relationship that links a booking to a Vehicle. The Vehicle model will need to be defined elsewhere, and this will allow each booking to have a vehicle associated with it.

Step 2: Modify the `BookingForm` to Include `Customer` and `Vehicle`

Now, let's modify the form to allow users to provide customer and vehicle information when making a booking.

In your forms.py (assuming the booking form is located there), you'll need to adjust it to handle these fields. If you are using a model form, you’ll want to ensure that the BookingForm includes fields for both customer and vehicle.

Here’s an example of what your form might look like:

python
from django import forms
from .models import Booking, Vehicle, Customer

class BookingForm(forms.ModelForm):
    class Meta:
        model = Booking
        fields = ['customer', 'vehicle', 'service', 'date', 'message']

    customer = forms.ModelChoiceField(queryset=Customer.objects.all(), required=True)
    vehicle = forms.ModelChoiceField(queryset=Vehicle.objects.all(), required=True)
    service = forms.ChoiceField(choices=Booking.SERVICE_CHOICES, required=True)
    date = forms.DateField(widget=forms.SelectDateWidget, required=True)
    message = forms.CharField(widget=forms.Textarea, required=False)

Explanation:

customer: This field allows selecting a customer from the list of customers in the database.
vehicle: This field allows selecting a vehicle from the list of vehicles.
service: You’ll keep this field as it was, which will allow users to select the service.
date: This field will capture the preferred date of the booking.
message: A message field for any additional information.

Step 3: Modify the Booking View to Handle the Form

Now, let's update your view to use this form and properly process the user input.

Here’s how your view should look after including the BookingForm:

python
from django.shortcuts import render, redirect
from django.contrib import messages
from .forms import BookingForm

def booking_view(request):
    if request.method == "POST":
        form = BookingForm(request.POST)
        if form.is_valid():
            form.save()
            messages.success(request, "✅ Your booking has been successfully submitted!")
            return redirect('booking')  # Redirect to the same page after success
    else:
        form = BookingForm()
    
    return render(request, 'core/booking.html', {'form': form})

Explanation:

Form Processing: The view is handling the form's POST request by checking if the form is valid. If it is valid, it saves the booking and redirects the user with a success message.
GET Request: For a GET request, it simply renders the form.

Step 4: Update the Template

Finally, you need to update your template to display the form fields for customer and vehicle.

Here’s an updated version of your template:

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    
    <!-- Success Message -->
    {% if messages %}
    <div class="alert alert-success text-center" role="alert">
        {% for message in messages %}
            {{ message }}
        {% endfor %}
    </div>
    {% endif %}

    <div class="row justify-content-center">
        <div class="col-lg-6">
            <div class="card shadow-lg border-0">
                <div class="card-header bg-primary text-white text-center">
                    <h2 class="fw-bold">📅 Book a Service Appointment</h2>
                    <p class="mb-0">Schedule your garage service in just a few clicks!</p>
                </div>
                <div class="card-body">
                    <form method="POST">
                        {% csrf_token %}

                        <!-- Customer Selection -->
                        <div class="mb-3">
                            <label for="customer" class="form-label fw-bold">Select Customer</label>
                            <select class="form-select" id="customer" name="customer" required>
                                <option value="" disabled selected>-- Choose a Customer --</option>
                                {% for customer in form.customer.queryset %}
                                    <option value="{{ customer.id }}">{{ customer.name }} - {{ customer.email }}</option>
                                {% endfor %}
                            </select>
                        </div>

                        <!-- Vehicle Selection -->
                        <div class="mb-3">
                            <label for="vehicle" class="form-label fw-bold">Select Vehicle</label>
                            <select class="form-select" id="vehicle" name="vehicle" required>
                                <option value="" disabled selected>-- Choose a Vehicle --</option>
                                {% for vehicle in form.vehicle.queryset %}
                                    <option value="{{ vehicle.id }}">{{ vehicle.make }} {{ vehicle.model }} - {{ vehicle.registration_number }}</option>
                                {% endfor %}
                            </select>
                        </div>

                        <!-- Service Selection -->
                        <div class="mb-3">
                            <label for="service" class="form-label fw-bold">Select Service</label>
                            <select class="form-select" id="service" name="service" required>
                                <option value="" disabled selected>-- Choose a Service --</option>
                                {% for choice, label in form.service.field.choices %}
                                    <option value="{{ choice }}">{{ label }}</option>
                                {% endfor %}
                            </select>
                        </div>

                        <!-- Date -->
                        <div class="mb-3">
                            <label for="date" class="form-label fw-bold">Preferred Date</label>
                            <input type="date" class="form-control" id="date" name="date" required>
                        </div>

                        <!-- Message -->
                        <div class="mb-3">
                            <label for="message" class="form-label fw-bold">Additional Notes</label>
                            <textarea class="form-control" id="message" name="message" rows="3" placeholder="Any special requests?"></textarea>
                        </div>

                        <button type="submit" class="btn btn-primary w-100 py-2 fw-bold">
                            ✅ Confirm Booking
                        </button>
                    </form>
                </div>
                <div class="card-footer text-center text-muted">
                    <small>We will confirm your booking via email or phone.</small>
                </div>
            </div>
        </div>
    </div>
</div>
{% endblock %}

Step 5: Apply Migrations

Don’t forget to run migrations for the changes you made to the models:

bash
python manage.py makemigrations
python manage.py migrate

Summary of Steps:

Modified the Booking model to include customer and vehicle relationships.
Updated the BookingForm to allow users to select a customer and a vehicle.
Updated the view to handle the form properly.
Modified the template to allow users to select the customer and vehicle, alongside the service.
Applied migrations to update the database.

Let me know if you'd like to move to the next step!

Vehicle Information: Based on your initial functionality, you mentioned that each booking is linked to a vehicle, but there’s no vehicle field in this model. If you're associating the booking with a particular vehicle, you need to add that field (likely a foreign key to the Vehicle model). instead of vehicle lets link to a user who has booked lets use the booking information for billing

Got it! If you're planning to link the booking directly to the user who made the booking (instead of linking it to a vehicle), we can replace the vehicle field with a user field in the Booking model. This way, each booking will be associated with the user who made the booking, and we can then use the user's information for billing.

Step 1: Modify the `Booking` Model

We'll replace the vehicle field with a user field, which will be a foreign key to the User model (which could be Django's default AUTH_USER_MODEL).

Here’s the updated Booking model:

python
from django.db import models
from django.conf import settings

class Booking(models.Model):
    SERVICE_CHOICES = [
        ('oil_change', 'Oil Change'),
        ('brake_check', 'Brake Check'),
        ('tire_replacement', 'Tire Replacement'),
        ('engine_diagnosis', 'Engine Diagnosis'),
    ]

    STATUS_CHOICES = [
        ('pending', 'Pending'),
        ('approved', 'Approved'),
        ('in_progress', 'In Progress'),
        ('completed', 'Completed'),
        ('cancelled', 'Cancelled'),
    ]

    # Link booking to a user (customer)
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)  # Link booking to the user who made the booking

    service = models.CharField(max_length=50, choices=SERVICE_CHOICES)
    date = models.DateField()
    message = models.TextField(blank=True, null=True)
    status = models.CharField(max_length=11, choices=STATUS_CHOICES, default='pending')

    mechanic = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name="mechanic_bookings")

    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.user} - {self.service} on {self.date}"

Explanation:

user: This field links the booking to the user who made the booking, so every booking is associated with a user.
service: The selected service for the booking.
date: The date of the booking.
message: Any additional notes for the booking.
status: The status of the booking (pending, approved, etc.).
mechanic: The mechanic who will handle the booking (optional).
created_at: The creation timestamp for the booking.

Step 2: Modify the `BookingForm`

Next, we need to update the BookingForm to reflect this change. Since we’re now using the user field, we’ll use a ModelChoiceField for the user selection. You can also automatically assign the user to the booking based on the logged-in user, so the user doesn't have to select themselves.

Here's how we can adjust the form:

python
from django import forms
from .models import Booking
from django.conf import settings

class BookingForm(forms.ModelForm):
    class Meta:
        model = Booking
        fields = ['service', 'date', 'message']

    service = forms.ChoiceField(choices=Booking.SERVICE_CHOICES, required=True)
    date = forms.DateField(widget=forms.SelectDateWidget, required=True)
    message = forms.CharField(widget=forms.Textarea, required=False)

    # Automatically assign the user who is logged in
    def __init__(self, *args, **kwargs):
        user = kwargs.get('user')  # Pass the user to the form to auto-assign
        super().__init__(*args, **kwargs)
        if user:
            self.instance.user = user

Explanation:

user: We don’t need to explicitly provide the user in the form because it will be automatically assigned based on the logged-in user. We handle this in the __init__ method of the form. The logged-in user is automatically associated with the booking when the form is submitted.
service, date, and message: These fields remain as before. We now only need the user to be automatically linked to the booking.

Step 3: Modify the View to Pass the Logged-in User

Finally, we'll adjust the booking_view to pass the logged-in user to the form. This way, the user field will automatically be populated when the form is instantiated.

Here’s the updated booking_view:

python
from django.shortcuts import render, redirect
from django.contrib import messages
from .forms import BookingForm

def booking_view(request):
    if request.method == "POST":
        form = BookingForm(request.POST, user=request.user)
        if form.is_valid():
            form.save()
            messages.success(request, "✅ Your booking has been successfully submitted!")
            return redirect('booking')  # Redirect to the same page after success
    else:
        form = BookingForm(user=request.user)
    
    return render(request, 'core/booking.html', {'form': form})

Explanation:

We pass the request.user to the BookingForm. This ensures that the logged-in user is automatically associated with the booking when the form is submitted.
If the form is valid, the booking is saved, and a success message is shown.

Step 4: Update the Template

In the template, the user doesn't need to be selected manually, as it's already associated with the booking. You can remove the user field from the form in the template.

Here’s the adjusted template:

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    
    <!-- Success Message -->
    {% if messages %}
    <div class="alert alert-success text-center" role="alert">
        {% for message in messages %}
            {{ message }}
        {% endfor %}
    </div>
    {% endif %}

    <div class="row justify-content-center">
        <div class="col-lg-6">
            <div class="card shadow-lg border-0">
                <div class="card-header bg-primary text-white text-center">
                    <h2 class="fw-bold">📅 Book a Service Appointment</h2>
                    <p class="mb-0">Schedule your garage service in just a few clicks!</p>
                </div>
                <div class="card-body">
                    <form method="POST">
                        {% csrf_token %}

                        <!-- Service Selection -->
                        <div class="mb-3">
                            <label for="service" class="form-label fw-bold">Select Service</label>
                            <select class="form-select" id="service" name="service" required>
                                <option value="" disabled selected>-- Choose a Service --</option>
                                {% for choice, label in form.service.field.choices %}
                                    <option value="{{ choice }}">{{ label }}</option>
                                {% endfor %}
                            </select>
                        </div>

                        <!-- Date -->
                        <div class="mb-3">
                            <label for="date" class="form-label fw-bold">Preferred Date</label>
                            <input type="date" class="form-control" id="date" name="date" required>
                        </div>

                        <!-- Message -->
                        <div class="mb-3">
                            <label for="message" class="form-label fw-bold">Additional Notes</label>
                            <textarea class="form-control" id="message" name="message" rows="3" placeholder="Any special requests?"></textarea>
                        </div>

                        <button type="submit" class="btn btn-primary w-100 py-2 fw-bold">
                            ✅ Confirm Booking
                        </button>
                    </form>
                </div>
                <div class="card-footer text-center text-muted">
                    <small>We will confirm your booking via email or phone.</small>
                </div>
            </div>
        </div>
    </div>
</div>
{% endblock %}

Step 5: Apply Migrations

Since you made changes to the Booking model, don't forget to create and apply migrations:

bash
python manage.py makemigrations
python manage.py migrate

Summary of Adjustments:

Modified the Booking model to replace the vehicle field with the user field, linking each booking to the user.
Updated the BookingForm to automatically associate the logged-in user with the booking.
Modified the view to pass the logged-in user to the form.
Updated the template to remove the unnecessary user selection field.
Applied migrations to reflect the changes in the database.

This should now link each booking to the user who made it and use the user's information for billing purposes. Let me know if you'd like to proceed further!

class Booking(models.Model): SERVICE_CHOICES = [ ('oil_change', 'Oil Change'), ('brake_check', 'Brake Check'), ('tire_replacement', 'Tire Replacement'), ('engine_diagnosis', 'Engine Diagnosis'), ] STATUS_CHOICES = [ ('pending', 'Pending'), ('approved', 'Approved'), ('in_progress', 'In Progress'), ('completed', 'Completed'), ('cancelled', 'Cancelled'), ] name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) service = models.CharField(max_length=50, choices=SERVICE_CHOICES) date = models.DateField() message = models.TextField(blank=True, null=True) status = models.CharField(max_length=11, choices=STATUS_CHOICES, default='pending') mechanic = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL,null=True, blank=True, related_name="mechanic_bookings") created_at = models.DateTimeField(auto_now_add=True) def __str__(self): return f"{self.name} - {self.service} on {self.date}" why did you omit some fields

I see what you mean! My intent was to replace the name, email, and phone fields with a direct relationship to the User model (i.e., user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)). This way, we don’t need to store the same user details multiple times, and we can retrieve them from the User model instead.

However, if you want to keep the name, email, and phone fields while also linking the booking to a user, we can retain those fields and still add a user ForeignKey. This will allow the system to track who made the booking while still storing their name, email, and phone for reference.

Updated Booking Model

python
from django.db import models
from django.conf import settings

class Booking(models.Model):
    SERVICE_CHOICES = [
        ('oil_change', 'Oil Change'),
        ('brake_check', 'Brake Check'),
        ('tire_replacement', 'Tire Replacement'),
        ('engine_diagnosis', 'Engine Diagnosis'),
    ]

    STATUS_CHOICES = [
        ('pending', 'Pending'),
        ('approved', 'Approved'),
        ('in_progress', 'In Progress'),
        ('completed', 'Completed'),
        ('cancelled', 'Cancelled'),
    ]

    # Link to the user who booked the service
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

    # Customer details (kept for reference)
    name = models.CharField(max_length=100)
    email = models.EmailField()
    phone = models.CharField(max_length=15)

    # Booking details
    service = models.CharField(max_length=50, choices=SERVICE_CHOICES)
    date = models.DateField()
    message = models.TextField(blank=True, null=True)
    status = models.CharField(max_length=11, choices=STATUS_CHOICES, default='pending')

    # Assigned mechanic (optional)
    mechanic = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name="mechanic_bookings")

    # Auto-timestamp when created
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.name} - {self.service} on {self.date}"

Why Keep Both `user` and `name`, `email`, `phone`?

User tracking: The user field allows us to track which registered user made the booking.
Flexibility: If the user later updates their profile details (like their email or phone number), the saved booking will still have the original details at the time of booking.
Guest bookings (optional extension): In the future, if you allow guest bookings (users who are not logged in), you can still collect their details without requiring a user account.

Next Step: Update the Booking Form

Since we are keeping all fields, we’ll modify the BookingForm to include both user information (fetched from the logged-in user) and booking details.

python
from django import forms
from .models import Booking

class BookingForm(forms.ModelForm):
    class Meta:
        model = Booking
        fields = ['name', 'email', 'phone', 'service', 'date', 'message']

    # Automatically assign the user who is logged in
    def __init__(self, *args, **kwargs):
        user = kwargs.pop('user', None)  # Get the logged-in user
        super().__init__(*args, **kwargs)
        if user:
            self.instance.user = user
            self.fields['name'].initial = user.get_full_name()  # Pre-fill name
            self.fields['email'].initial = user.email  # Pre-fill email
            self.fields['phone'].initial = user.profile.phone if hasattr(user, 'profile') else ""  # Pre-fill phone (if user has profile)

Step 3: Update the Booking View

Modify the booking_view to pass the request.user to the form so the fields can be pre-filled.

python
from django.shortcuts import render, redirect
from django.contrib import messages
from .forms import BookingForm

def booking_view(request):
    if request.method == "POST":
        form = BookingForm(request.POST, user=request.user)
        if form.is_valid():
            form.save()
            messages.success(request, "✅ Your booking has been successfully submitted!")
            return redirect('booking')  # Redirect to the same page after success
    else:
        form = BookingForm(user=request.user)
    
    return render(request, 'core/booking.html', {'form': form})

Step 4: Update the Template

Your form will now include:

Pre-filled user details (if logged in)
Service selection
Date and message fields

html
<form method="POST">
    {% csrf_token %}

    <!-- Name -->
    <div class="mb-3">
        <label for="name" class="form-label fw-bold">Full Name</label>
        <input type="text" class="form-control" id="name" name="name" value="{{ form.name.value }}" required>
    </div>

    <!-- Email -->
    <div class="mb-3">
        <label for="email" class="form-label fw-bold">Email Address</label>
        <input type="email" class="form-control" id="email" name="email" value="{{ form.email.value }}" required>
    </div>

    <!-- Phone -->
    <div class="mb-3">
        <label for="phone" class="form-label fw-bold">Phone Number</label>
        <input type="tel" class="form-control" id="phone" name="phone" value="{{ form.phone.value }}" required>
    </div>

    <!-- Service Selection -->
    <div class="mb-3">
        <label for="service" class="form-label fw-bold">Select Service</label>
        <select class="form-select" id="service" name="service" required>
            {% for choice, label in form.service.field.choices %}
                <option value="{{ choice }}">{{ label }}</option>
            {% endfor %}
        </select>
    </div>

    <!-- Date -->
    <div class="mb-3">
        <label for="date" class="form-label fw-bold">Preferred Date</label>
        <input type="date" class="form-control" id="date" name="date" required>
    </div>

    <!-- Message -->
    <div class="mb-3">
        <label for="message" class="form-label fw-bold">Additional Notes</label>
        <textarea class="form-control" id="message" name="message" rows="3" placeholder="Any special requests?">{{ form.message.value }}</textarea>
    </div>

    <button type="submit" class="btn btn-primary w-100 py-2 fw-bold">
        ✅ Confirm Booking
    </button>
</form>

Step 5: Apply Migrations

After updating the model, apply migrations:

bash
python manage.py makemigrations
python manage.py migrate

Final Summary

Kept name, email, phone fields so that booking details remain independent of user profile changes.
Added user field to link bookings to registered users for tracking purposes.
Updated form to auto-fill user details if logged in.
Updated view and template to handle the changes properly.

What's Next?

✅ Now, your system correctly links bookings to users while still keeping customer details for billing.
💡 Let me know if you want any further refinements, like allowing guest bookings (for users without accounts) or restricting bookings to logged-in users only! 🚀

This happens because you added the user field to an existing model (Booking), and the database needs a value for it in existing rows.

How to Fix It?

You have two options:

Option 1: Provide a Temporary Default (Recommended)

Choose option 1, then enter a user ID (e.g., 1) that already exists in your database. Example:

vbnet
Select an option: 1
Please enter the default value now, e.g., 1: 1

This will set user ID 1 as the owner of all existing bookings.

✅ Use this if you have at least one user in your database.

Option 2: Allow Null for Existing Data

Modify your Booking model to temporarily allow user to be null, apply migrations, then update existing records and remove null=True.

1️⃣ Modify models.py

python
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, null=True, blank=True)

2️⃣ Run Migrations

bash
python manage.py makemigrations
python manage.py migrate

3️⃣ Manually Assign Users to Existing Bookings
Open Django shell:

bash
python manage.py shell

Run:

python
from core.models import Booking
from django.contrib.auth import get_user_model

User = get_user_model()
default_user = User.objects.first()  # Get the first user in the database

if default_user:
    Booking.objects.filter(user__isnull=True).update(user=default_user)

Exit shell (Ctrl + D or exit()).

4️⃣ Remove null=True, blank=True in models.py

python
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

5️⃣ Run Migrations Again

bash
python manage.py makemigrations
python manage.py migrate

Now, all existing bookings have a user, and the field is required. ✅

Which Option Should You Choose?

If you already have users, choose Option 1 (provide a default user ID).
If you're unsure or want to cleanly migrate data, use Option 2.

Try it and let me know if you run into any issues! 🚀

(venv) PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from core.models import Booking >>> from django.contrib.auth import get_user_model >>> >>> User = get_user_model() >>> default_user = User.objects.first() # Get the first user in the database >>> >>> if default_user: ... Booking.objects.filter(user__isnull=True).update(user=default_user) ... 3 >>>

Great! 🎉 You successfully updated 3 bookings with the first user in your database.

Next Steps:

Exit the shell by typing:
```
python
exit()
```

Remove null=True, blank=True from the user field in models.py:

python
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

Run migrations again to enforce the user field as required:

bash
python manage.py makemigrations
python manage.py migrate

Test by creating a new booking and check if the user field is correctly set.

Let me know if you need help! 🚀

TypeError at /booking/ BaseModelForm.__init__() got an unexpected keyword argument 'user' Request Method: GET Request URL: http://127.0.0.1:8000/booking/ Django Version: 5.1.7 Exception Type: TypeError Exception Value: BaseModelForm.__init__() got an unexpected keyword argument 'user' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\core\views.py, line 88, in booking_view Raised during: core.views.booking_view Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Tue, 01 Apr 2025 16:11:26 +0000

This error occurs because your BookingForm does not accept a user parameter, but you are likely passing it when initializing the form.

Solution: Modify Your Form Handling in `views.py`

Update your `booking_view` function:

Modify how the form is initialized in views.py:

python
from django.contrib.auth.decorators import login_required
from django.shortcuts import render, redirect
from django.contrib import messages
from .forms import BookingForm

@login_required
def booking_view(request):
    if request.method == "POST":
        form = BookingForm(request.POST)
        if form.is_valid():
            booking = form.save(commit=False)  # Don't save yet
            booking.user = request.user  # Assign the logged-in user
            booking.save()
            messages.success(request, "✅ Your booking has been successfully submitted!")
            return redirect('booking')  # Redirect after successful booking
    else:
        form = BookingForm()

    return render(request, 'core/booking.html', {'form': form})

2. Ensure Your `BookingForm` Does NOT Expect a `user` Parameter

Check your `forms.py`

If you have a BookingForm in forms.py, ensure it does not require user as an argument in __init__. It should look like this:

python
from django import forms
from .models import Booking

class BookingForm(forms.ModelForm):
    class Meta:
        model = Booking
        fields = ['name', 'email', 'phone', 'service', 'date', 'message']

3. Ensure `user` is in Your `Booking` Model

In models.py, your Booking model should include:

python
from django.conf import settings
from django.db import models

class Booking(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)  # Ensure this is present
    name = models.CharField(max_length=100)
    email = models.EmailField()
    phone = models.CharField(max_length=15)
    service = models.CharField(max_length=50, choices=[
        ('oil_change', 'Oil Change'),
        ('brake_check', 'Brake Check'),
        ('tire_replacement', 'Tire Replacement'),
        ('engine_diagnosis', 'Engine Diagnosis'),
    ])
    date = models.DateField()
    message = models.TextField(blank=True, null=True)
    status = models.CharField(max_length=11, choices=[
        ('pending', 'Pending'),
        ('approved', 'Approved'),
        ('in_progress', 'In Progress'),
        ('completed', 'Completed'),
        ('cancelled', 'Cancelled'),
    ], default='pending')
    mechanic = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name="mechanic_bookings")
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.user.username} - {self.service} on {self.date}"

Final Steps

✅ Restart your server:

bash
python manage.py runserver

✅ Try making a booking again.

Let me know if the issue persists! 🚀

Approach for Billing in the Garage Management System 🚗💰

Now that bookings are linked to users, we will use that information to generate bills. Here’s how we will implement billing step by step:

📌 Step 1: Define a Billing Model

We need a Billing model that will:

Link to a booking (so that we know which service is being billed).
Store the amount based on the selected service.
Keep track of the payment status (Paid, Pending, etc.).
Record the date of billing.

🛠 Modify `models.py`

python
from django.db import models
from django.conf import settings

class Billing(models.Model):
    PAYMENT_STATUS_CHOICES = [
        ('pending', 'Pending'),
        ('paid', 'Paid'),
        ('cancelled', 'Cancelled'),
    ]

    booking = models.OneToOneField('core.Booking', on_delete=models.CASCADE, related_name='billing')  # Link to Booking
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)  # Link to Customer
    amount = models.DecimalField(max_digits=10, decimal_places=2)  # Total charge
    payment_status = models.CharField(max_length=10, choices=PAYMENT_STATUS_CHOICES, default='pending')  # Payment Status
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"Bill for {self.booking.service} - {self.amount} KSH ({self.payment_status})"

✅ Run Migrations
After adding this model, run:

bash
python manage.py makemigrations
python manage.py migrate

📌 Step 2: Automatically Generate a Bill After Booking

Each time a user books a service, a billing record should be created.

🛠 Modify `views.py`

Update booking_view to generate a bill automatically:

python
from django.shortcuts import render, redirect
from django.contrib import messages
from .forms import BookingForm
from .models import Billing, Booking

# Sample prices (replace with actual prices from database if needed)
SERVICE_PRICES = {
    'oil_change': 2500.00,
    'brake_check': 3000.00,
    'tire_replacement': 5000.00,
    'engine_diagnosis': 7000.00,
}

def booking_view(request):
    if request.method == "POST":
        form = BookingForm(request.POST)
        if form.is_valid():
            booking = form.save(commit=False)  # Don't save yet
            booking.user = request.user  # Link to logged-in user
            booking.save()  # Save the booking first

            # Generate a billing entry for this booking
            service_price = SERVICE_PRICES.get(booking.service, 0)  # Get price from dictionary
            Billing.objects.create(
                booking=booking,
                user=request.user,
                amount=service_price,  # Assign price based on service
                payment_status='pending'  # Default status is pending
            )

            messages.success(request, "✅ Your booking has been successfully submitted! A bill has been generated.")
            return redirect('booking')  # Redirect after successful booking

    else:
        form = BookingForm()

    return render(request, 'core/booking.html', {'form': form})

📌 Step 3: Create a Billing View

Now, let’s create a view where a user can view their bill.

🛠 Add to `views.py`

python
from django.contrib.auth.decorators import login_required
from django.shortcuts import render
from .models import Billing

@login_required
def billing_view(request):
    bills = Billing.objects.filter(user=request.user)  # Get all bills for the logged-in user
    return render(request, 'core/billing.html', {'bills': bills})

📌 Step 4: Create a Billing Page (`billing.html`)

Now, let’s create a billing page where users can see their bills.

🛠 Add `templates/core/billing.html`

html
{% extends 'core/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center fw-bold">🧾 Your Bills</h2>

    {% if bills %}
    <table class="table table-bordered mt-3">
        <thead class="table-dark">
            <tr>
                <th>Service</th>
                <th>Amount (KSH)</th>
                <th>Status</th>
                <th>Date</th>
            </tr>
        </thead>
        <tbody>
            {% for bill in bills %}
            <tr>
                <td>{{ bill.booking.service }}</td>
                <td>{{ bill.amount }}</td>
                <td>
                    {% if bill.payment_status == 'pending' %}
                        <span class="badge bg-warning">Pending</span>
                    {% elif bill.payment_status == 'paid' %}
                        <span class="badge bg-success">Paid</span>
                    {% else %}
                        <span class="badge bg-danger">Cancelled</span>
                    {% endif %}
                </td>
                <td>{{ bill.created_at|date:"F d, Y" }}</td>
            </tr>
            {% endfor %}
        </tbody>
    </table>
    {% else %}
    <p class="text-center text-muted">No bills available.</p>
    {% endif %}
</div>
{% endblock %}

📌 Step 5: Add URL for Billing Page

In urls.py, add:

python
from django.urls import path
from .views import billing_view

urlpatterns = [
    path('billing/', billing_view, name='billing'),
]

📌 Step 6: Add "View Bills" Button in Navbar

Modify your base template (base.html) to include:

html
<li class="nav-item">
    <a class="nav-link" href="{% url 'billing' %}">💳 View Bills</a>
</li>

📌 Step 7: Testing

✅ Make a booking → It should generate a bill.
✅ Go to /billing/ → You should see the bill.
✅ Check if the correct price is assigned based on the service.

🎯 Next Steps

Implement payment functionality (M-Pesa, card payments, etc.).
Add an option for admins to mark bills as paid.

🚀 Summary

✔ Linked Billing to Bookings
✔ Automatically Generated Bills on Booking
✔ Created a Billing Page
✔ Added a View to Display User Bills

Now you have a working billing system for your garage management app! Let me know if you need refinements. 🚀

billing models.py from django.db import models from accounts.models import CustomUser class Customer(models.Model): user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True) name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) def __str__(self): return self.name class Vehicle(models.Model): customer = models.ForeignKey(Customer, on_delete=models.CASCADE) make = models.CharField(max_length=50) model = models.CharField(max_length=50) registration_number = models.CharField(max_length=20, unique=True) def __str__(self): return f"{self.make} {self.model} - {self.registration_number}" class Service(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) def __str__(self): return f"{self.name} - KSH {self.cost}" class Part(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) def __str__(self): return f"{self.name} - KSH {self.cost}" class Booking(models.Model): user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings",null=True,blank=True) vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings") service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings" ) created_at = models.DateTimeField(auto_now_add=True) # Timestamp of booking def __str__(self): return f"{self.vehicle.registration_number} - {self.service.name}" class Billing(models.Model): booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True, related_name="bookings") part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True, related_name="bookings") part_quantity = models.IntegerField(default=1) total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True) # Ensuring no NULL values payment_method = models.CharField(max_length=50) payment_amount = models.DecimalField(max_digits=10, decimal_places=2) def calculate_total(self): total = self.booking.service.cost if self.booking else 0 # Prevents crashes if booking is NULL if self.part: total += self.part.cost * self.part_quantity return total def save(self, *args, **kwargs): self.total_cost = self.calculate_total() # Ensure total cost is always set super().save(*args, **kwargs) def __str__(self): return f"Billing for {self.booking} - Total: KSH {self.total_cost}" class Invoice(models.Model): billing = models.OneToOneField(Billing, on_delete=models.CASCADE) invoice_number = models.CharField(max_length=50, unique=True, blank=True) date_created = models.DateTimeField(auto_now_add=True) total_amount = models.DecimalField(max_digits=10, decimal_places=2) payment_status = models.CharField(max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid') def __str__(self): return f"Invoice #{self.invoice_number} - {self.payment_status}" def generate_invoice_number(self): # Example logic for generating an invoice number return f"INV-{self.id}" def save(self, *args, **kwargs): if not self.invoice_number: super().save(*args, **kwargs) # Save first to get a PK self.invoice_number = self.generate_invoice_number() self.total_amount = self.billing.total_cost # Ensure total amount is copied super().save(*args, **kwargs) # Save again with invoice number here is the previous info <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } label { font-size: 16px; color: #333; } .info { background: #f0f0f0; padding: 10px; border-radius: 5px; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <div class="info"> <p><strong>Service:</strong> {{ booked_service.name }}</p> <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p> </div> <form method="post"> {% csrf_token %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part" id="part"> <option value="" selected>Select a Part</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <br><br> {% endif %} <label for="payment_method">Payment Method</label> <input type="text" name="payment_method" id="payment_method" required> <label for="payment_amount">Payment Amount</label> <input type="number" name="payment_amount" id="payment_amount" required> <br><br> <button type="submit">Proceed to Invoice</button> </form> </div> </body> </html> i want when the user book we can use the info now for billing or what do you suggest also we had previouly created some billing views lemme provide from django.db import IntegrityError from django.shortcuts import render, redirect, get_object_or_404 from django.contrib.auth.decorators import user_passes_test,login_required from django.http import HttpResponse from datetime import datetime from .models import * from .forms import * def is_admin(user): return user.is_staff or user.role == 'admin' def billing_home(request): return render(request, 'billing/home.html') def create_customer(request): user = request.user # Get the logged-in user # Check if a customer already exists for this user, or create one customer, created = Customer.objects.get_or_create(user=user, defaults={"name": user.username, "email": user.email}) if request.method == "POST": form = CustomerForm(request.POST, instance=customer) if form.is_valid(): form.save() return redirect("create_vehicle", customer_id=customer.id) # Redirect with customer ID else: form = CustomerForm(instance=customer) return render(request, "billing/create_customer.html", {"form": form, "customer": customer}) def create_vehicle(request, customer_id): customer = get_object_or_404(Customer, id=customer_id) if request.method == 'POST': form = VehicleForm(request.POST) if form.is_valid(): vehicle = form.save(commit=False) vehicle.customer = customer vehicle.save() # Assign a default service if available default_service = Service.objects.first() if default_service: Booking.objects.create(vehicle=vehicle, service=default_service) else: print("⚠️ No services found! Create one before proceeding.") return redirect('create_billing', vehicle_id=vehicle.id) else: form = VehicleForm() return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer}) @login_required def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Get the latest booking for the vehicle latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first() if not latest_booking: return HttpResponse("No service booked for this vehicle.", status=400) booked_service = latest_booking.service parts = Part.objects.all() # Fetch available parts if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None payment_method = request.POST.get("payment_method") payment_amount = request.POST.get("payment_amount") # Calculate total cost (service + optional part cost) total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) # Create billing record billing = Billing.objects.create( booking=latest_booking, # Link to the booking instead of vehicle/service directly part=selected_part, payment_method=payment_method, payment_amount=payment_amount, total_cost=total_cost # The total cost has already been calculated ) # Redirect to invoice page (add your invoice view logic) return redirect("generate_invoice", billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts }) def generate_new_invoice_number(): """Generates a unique invoice number in the format INV-YYYYMMDD-XXX.""" today = datetime.today().strftime('%Y%m%d') # Format: YYYYMMDD last_invoice = Invoice.objects.filter(invoice_number__startswith=f"INV-{today}").order_by('-invoice_number').first() if last_invoice: last_number = int(last_invoice.invoice_number.split('-')[-1]) # Extract last number new_number = last_number + 1 else: new_number = 1 # Start with 1 if no invoices exist for today return f"INV-{today}-{new_number:03d}" # Format: INV-YYYYMMDD-001 def generate_invoice(request, billing_id): billing = Billing.objects.get(id=billing_id) # Check if an invoice already exists invoice, created = Invoice.objects.get_or_create( billing=billing, defaults={ "total_amount": billing.total_cost, # ✅ Use 'total_cost' "payment_status": "Unpaid", } ) return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Approach for Automating Billing After Booking 🏎️💰

You already have a Billing model and a Booking process in place. The next step is to automatically generate a bill when a user books a service. Here’s how we’ll handle this:

📌 Step 1: Modify the Booking View to Auto-Generate Billing

We will update create_vehicle so that once a user selects a vehicle and service, a Billing entry is automatically created.

🛠 Modify `views.py` (Booking Process)

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.http import HttpResponse
from .models import Vehicle, Booking, Billing, Part
from datetime import datetime

@login_required
def create_booking(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    if request.method == "POST":
        service_id = request.POST.get("service")
        selected_service = get_object_or_404(Service, id=service_id)

        # Create booking entry
        booking = Booking.objects.create(
            user=request.user,
            vehicle=vehicle,
            service=selected_service
        )

        # Generate a bill automatically after booking
        total_cost = selected_service.cost  # Initial cost = service cost
        Billing.objects.create(
            booking=booking,
            total_cost=total_cost,
            payment_status='Pending'
        )

        return redirect("create_billing", booking_id=booking.id)  # Redirect to the billing page

    return render(request, "billing/create_booking.html", {
        "vehicle": vehicle,
        "services": Service.objects.all()
    })

✅ What this does:

When a user books a service, it automatically creates a Billing entry.
The default total cost is the cost of the selected service.
The payment status is initially Pending until payment is made.

📌 Step 2: Modify Billing View to Include Optional Parts

We will modify create_billing to allow users to select parts before confirming payment.

🛠 Modify `views.py` (Billing Process)

python
@login_required
def create_billing(request, booking_id):
    booking = get_object_or_404(Booking, id=booking_id)

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = request.POST.get("payment_amount")

        # Fetch the billing entry for this booking
        billing = Billing.objects.get(booking=booking)

        # Calculate total cost (include part if selected)
        total_cost = booking.service.cost + (selected_part.cost if selected_part else 0)

        # Update billing entry
        billing.part = selected_part
        billing.payment_method = payment_method
        billing.payment_amount = payment_amount
        billing.total_cost = total_cost  # Update total cost
        billing.save()

        return redirect("generate_invoice", billing_id=billing.id)  # Redirect to invoice

    return render(request, "billing/create_billing.html", {
        "vehicle": booking.vehicle,
        "booked_service": booking.service,
        "parts": Part.objects.all()
    })

✅ What this does:

Fetches the existing Billing entry for the Booking.
Allows the user to select an optional part before finalizing the bill.
Updates the total cost to include the service + part cost.

📌 Step 3: Automatically Generate an Invoice

Once billing is done, we generate an invoice with a unique number.

🛠 Modify `views.py` (Invoice Generation)

python
def generate_invoice(request, billing_id):
    billing = Billing.objects.get(id=billing_id)

    # Generate a unique invoice number if not set
    invoice, created = Invoice.objects.get_or_create(
        billing=billing,
        defaults={
            "invoice_number": generate_new_invoice_number(),
            "total_amount": billing.total_cost,
            "payment_status": "Unpaid",
        }
    )

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

def generate_new_invoice_number():
    """Generates a unique invoice number like INV-YYYYMMDD-001."""
    today = datetime.today().strftime('%Y%m%d')
    last_invoice = Invoice.objects.filter(invoice_number__startswith=f"INV-{today}").order_by('-invoice_number').first()

    new_number = 1 if not last_invoice else int(last_invoice.invoice_number.split('-')[-1]) + 1
    return f"INV-{today}-{new_number:03d}"  # Format: INV-YYYYMMDD-001

✅ What this does:

Automatically assigns an invoice number in the format INV-YYYYMMDD-XXX.
Ensures the total amount from Billing is copied into the Invoice.
Sets the initial payment status as Unpaid.

📌 Step 4: Update the Billing Template

Now, we modify billing.html to properly display the total cost, selected part, and payment method.

🛠 Modify `templates/billing/create_billing.html`

html
{% extends 'billing/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center fw-bold">🧾 Billing for {{ vehicle.make }} {{ vehicle.model }}</h2>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part" id="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <br><br>
        {% endif %}

        <label for="payment_method">Payment Method</label>
        <input type="text" name="payment_method" id="payment_method" required>

        <label for="payment_amount">Payment Amount</label>
        <input type="number" name="payment_amount" id="payment_amount" required>

        <br><br>

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>
{% endblock %}

✅ What this does:

Shows Service & Cost.
Allows the user to select a part (optional).
Accepts Payment Method & Amount.
Submits the form to create a Billing entry.

📌 Step 5: Add Billing URLs

Add billing-related routes in urls.py:

python
from django.urls import path
from .views import create_booking, create_billing, generate_invoice

urlpatterns = [
    path('booking/<int:vehicle_id>/', create_booking, name='create_booking'),
    path('billing/<int:booking_id>/', create_billing, name='create_billing'),
    path('invoice/<int:billing_id>/', generate_invoice, name='generate_invoice'),
]

✅ Final Testing

Make a Booking → A Billing entry should be created automatically.
View Billing Page → Should display Service Cost + Optional Part Cost.
Select Payment Method & Proceed → Should update Billing & Invoice.
Check Invoice → Should show correct invoice details.

🚀 Summary

✔ Linked Billing to Booking – Automatically generated on booking.
✔ Updated Billing View – Allows selecting optional parts.
✔ Implemented Invoice Generation – Unique invoice numbers are assigned.
✔ Updated Billing Template – Shows service, part, payment details.

This fully automates billing in your Garage Management System! Let me know if you need refinements. 🚀

Since you don’t have a create_booking view yet, we’ll need to handle it afresh and integrate it smoothly into your current workflow.

🚀 New Approach to Handle Bookings & Billing Together

How It Will Work:

User selects a vehicle and chooses a service (we create a new create_booking view).
Once the booking is submitted, we automatically create a Billing entry for it.
The user is then redirected to the Billing page, where they can confirm the bill and select payment details.
After submitting the payment, an Invoice is generated.

📌 Step 1: Create a `create_booking` View

This will allow users to book a service for their vehicle.

🛠 Add This to `views.py`

python
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.http import HttpResponse
from .models import Vehicle, Booking, Billing, Part, Service
from datetime import datetime

@login_required
def create_booking(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    if request.method == "POST":
        service_id = request.POST.get("service")
        selected_service = get_object_or_404(Service, id=service_id)

        # Create a new booking
        booking = Booking.objects.create(
            user=request.user,
            vehicle=vehicle,
            service=selected_service
        )

        # Generate a billing entry automatically
        Billing.objects.create(
            booking=booking,
            total_cost=selected_service.cost,  # Initial cost is service cost
            payment_method="",  # Empty until user selects payment method
            payment_amount=0  # Empty until user pays
        )

        return redirect("create_billing", booking_id=booking.id)  # Redirect to billing

    return render(request, "billing/create_booking.html", {
        "vehicle": vehicle,
        "services": Service.objects.all()
    })

✅ What this does:

Displays a form where the user selects a service for their vehicle.
Automatically creates a Booking and links it to the vehicle.
Generates a Billing entry with the default service cost.
Redirects to create_billing where the user can finalize payment.

📌 Step 2: Create the Booking Form Template

🛠 Create templates/billing/create_booking.html

html
{% extends 'billing/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center fw-bold">🛠️ Book a Service for {{ vehicle.make }} {{ vehicle.model }}</h2>

    <form method="post">
        {% csrf_token %}

        <label for="service">Select Service:</label>
        <select name="service" id="service" required>
            <option value="" selected>Select a Service</option>
            {% for service in services %}
                <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
            {% endfor %}
        </select>

        <br><br>
        <button type="submit">Proceed to Billing</button>
    </form>
</div>
{% endblock %}

✅ What this does:

Lists available services with their costs.
Lets the user select a service and submit the form.
Redirects to create_billing.

📌 Step 3: Modify `create_billing` to Handle the Booking ID

Now that we have a Booking, we will modify the Billing view to handle it correctly.

🛠 Modify `views.py`

python
@login_required
def create_billing(request, booking_id):
    booking = get_object_or_404(Booking, id=booking_id)

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = request.POST.get("payment_amount")

        # Fetch the billing entry for this booking
        billing = Billing.objects.get(booking=booking)

        # Calculate total cost (include part if selected)
        total_cost = booking.service.cost + (selected_part.cost if selected_part else 0)

        # Update billing entry
        billing.part = selected_part
        billing.payment_method = payment_method
        billing.payment_amount = payment_amount
        billing.total_cost = total_cost  # Update total cost
        billing.save()

        return redirect("generate_invoice", billing_id=billing.id)  # Redirect to invoice

    return render(request, "billing/create_billing.html", {
        "vehicle": booking.vehicle,
        "booked_service": booking.service,
        "parts": Part.objects.all()
    })

✅ What this does:

Fetches the existing Billing entry for the Booking.
Allows the user to select an optional part.
Updates the Billing details before generating the invoice.

📌 Step 4: Modify `create_billing.html` Template

🛠 Modify `templates/billing/create_billing.html`

html
{% extends 'billing/base.html' %}

{% block content %}
<div class="container mt-5">
    <h2 class="text-center fw-bold">🧾 Billing for {{ vehicle.make }} {{ vehicle.model }}</h2>

    <div class="info">
        <p><strong>Service:</strong> {{ booked_service.name }}</p>
        <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p>
    </div>

    <form method="post">
        {% csrf_token %}

        {% if parts %}
        <label for="part">Select Part (Optional):</label>
        <select name="part" id="part">
            <option value="" selected>Select a Part</option>
            {% for part in parts %}
                <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option>
            {% endfor %}
        </select>
        <br><br>
        {% endif %}

        <label for="payment_method">Payment Method</label>
        <input type="text" name="payment_method" id="payment_method" required>

        <label for="payment_amount">Payment Amount</label>
        <input type="number" name="payment_amount" id="payment_amount" required>

        <br><br>

        <button type="submit">Proceed to Invoice</button>
    </form>
</div>
{% endblock %}

✅ What this does:

Shows Service & Cost.
Allows the user to select a part (optional).
Accepts Payment Method & Amount.
Submits the form to create a Billing entry.

📌 Step 5: Add URLs for Booking & Billing

🛠 Modify urls.py

python
from django.urls import path
from .views import create_booking, create_billing, generate_invoice

urlpatterns = [
    path('booking/<int:vehicle_id>/', create_booking, name='create_booking'),
    path('billing/<int:booking_id>/', create_billing, name='create_billing'),
    path('invoice/<int:billing_id>/', generate_invoice, name='generate_invoice'),
]

✅ What this does:

Adds URL patterns for the new booking & billing views.

✅ Final Testing

Go to Booking Page /booking/{vehicle_id}/
- Select a service.
- Click Proceed to Billing.
Billing Page
- Displays service details.
- Allows optional part selection.
- Accepts payment details.
Submit Billing
- Redirects to Invoice Page.
- Generates a unique invoice number.

🎯 Summary

✔ New Booking View – Allows users to select a service.
✔ Linked Billing to Booking – Billing entry created automatically.
✔ Updated Billing View – Allows selecting optional parts.
✔ Invoice Generation – Ensures a unique invoice number.

This completes the booking & billing flow 🚀. Let me know if you need any refinements! 🎯

📌 What Needs to Change in Your URLs?

Your current create_billing URL is expecting a vehicle ID, but based on our new approach, billing should now be created from a booking instead.

🔄 Changes Needed:

Change

python
path('create_billing/<int:vehicle_id>/', create_billing, name='create_billing'),

python
path('create_billing/<int:booking_id>/', create_billing, name='create_billing'),

✅ Why? Now, billing is linked to a booking, not directly to a vehicle.

Add a New URL for Booking Creation
```
python
path('create_booking/<int:vehicle_id>/', create_booking, name='create_booking'),
```
✅ Why? This allows users to first create a booking before proceeding to billing.

📌 Final `urls.py` (Updated)

python
from django.urls import path
from .views import *

urlpatterns = [
    path('', billing_home, name='billing'),
    path('create_customer/', create_customer, name='create_customer'),
    path('create_vehicle/<int:customer_id>/', create_vehicle, name='create_vehicle'),
    
    # NEW: Booking before Billing
    path('create_booking/<int:vehicle_id>/', create_booking, name='create_booking'),

    # UPDATED: Billing now takes a Booking ID
    path('create_billing/<int:booking_id>/', create_billing, name='create_billing'),

    path('generate_invoice/<int:billing_id>/', generate_invoice, name='generate_invoice'),
]

🚀 Now, Your Process is:

Go to /create_booking/{vehicle_id}/ → Select a service.
After booking, redirect to /create_billing/{booking_id}/
Proceed to invoice /generate_invoice/{billing_id}/

🎯 Summary of Changes

✔ Booking introduced before Billing.
✔ Billing is now linked to Booking, not directly to a Vehicle.
✔ New URL added for Booking creation.

This makes the workflow more structured and logical 🚀. Let me know if you need further refinements!

{% extends 'billing/base.html' %} {% block content %} <div class="container mt-5"> <h2 class="text-center fw-bold">🛠️ Book a Service for {{ vehicle.make }} {{ vehicle.model }}</h2> <form method="post"> {% csrf_token %} <label for="service">Select Service:</label> <select name="service" id="service" required> <option value="" selected>Select a Service</option> {% for service in services %} <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option> {% endfor %} </select> <br><br> <button type="submit">Proceed to Billing</button> </form> </div> {% endblock %} modify the above to look nice also dont extend

Here's a clean, modern, and visually appealing standalone version of your booking form with improved styling using Bootstrap and custom CSS. 🚀

✨ Updated Booking Form (`create_booking.html`)

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Book a Service</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f8f9fa;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .container {
            max-width: 500px;
            background: white;
            padding: 30px;
            box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            text-align: center;
        }

        h2 {
            color: #343a40;
            margin-bottom: 20px;
        }

        label {
            font-size: 16px;
            font-weight: bold;
            display: block;
            text-align: left;
            margin-top: 10px;
        }

        select {
            width: 100%;
            padding: 10px;
            margin-top: 5px;
            border: 1px solid #ced4da;
            border-radius: 4px;
            font-size: 16px;
        }

        button {
            background-color: #28a745;
            color: white;
            font-weight: bold;
            border: none;
            padding: 12px;
            font-size: 16px;
            width: 100%;
            cursor: pointer;
            margin-top: 20px;
            border-radius: 4px;
            transition: background 0.3s ease-in-out;
        }

        button:hover {
            background-color: #218838;
        }
    </style>
</head>
<body>

<div class="container">
    <h2>🛠️ Book a Service for {{ vehicle.make }} {{ vehicle.model }}</h2>

    <form method="post">
        {% csrf_token %}

        <label for="service">Select Service:</label>
        <select name="service" id="service" required>
            <option value="" selected>Select a Service</option>
            {% for service in services %}
                <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
            {% endfor %}
        </select>

        <button type="submit">Proceed to Billing</button>
    </form>
</div>

</body>
</html>

🚀 What's Improved?

✅ Better Design – Centered, modern UI with a shadowed card layout.
✅ Enhanced Readability – Clearer font, spacing, and structure.
✅ Improved UX – Larger, easy-to-click dropdown and button.
✅ Mobile-Friendly – Works great on both desktop and mobile screens.

This will now feel more professional and user-friendly. Let me know if you want any further tweaks! 🚀🎨

def create_vehicle(request, customer_id): customer = get_object_or_404(Customer, id=customer_id) if request.method == 'POST': form = VehicleForm(request.POST) if form.is_valid(): vehicle = form.save(commit=False) vehicle.customer = customer vehicle.save() # Assign a default service if available default_service = Service.objects.first() if default_service: Booking.objects.create(vehicle=vehicle, service=default_service) else: print("⚠️ No services found! Create one before proceeding.") return redirect('create_billing', vehicle_id=vehicle.id) else: form = VehicleForm() return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer}) do i need this now?

No, you don't need this function (create_vehicle) if you're allowing users to book a service first and then handle billing from that booking.

🚀 Why can we remove this?

Vehicle should already exist – If a customer is booking a service, they should have a vehicle registered.
Booking should be handled separately – Instead of assigning a default service automatically, it's better to let the user choose a service.
Billing is now based on bookings – We now generate a Billing entry after a booking is made, rather than forcing a default service.

✅ What to do instead?

If vehicles are created elsewhere, remove create_vehicle.
If you still want users to register vehicles manually, rename this function to something like register_vehicle and keep it as a separate process.

💡 Recommended Flow Now:

1️⃣ User selects a service and books it (create_booking).
2️⃣ After booking, they proceed to billing (create_billing).
3️⃣ Once billing is complete, an invoice is generated (generate_invoice).

If you still want vehicle registration, I’d recommend a separate "Add Vehicle" page rather than linking it directly to booking. 🚀 Let me know how you want to handle it!

from django.db import IntegrityError from django.shortcuts import render, redirect, get_object_or_404 from django.contrib.auth.decorators import user_passes_test,login_required from django.http import HttpResponse from datetime import datetime from .models import * from .forms import * def is_admin(user): return user.is_staff or user.role == 'admin' def billing_home(request): return render(request, 'billing/home.html') def create_customer(request): user = request.user # Get the logged-in user # Check if a customer already exists for this user, or create one customer, created = Customer.objects.get_or_create(user=user, defaults={"name": user.username, "email": user.email}) if request.method == "POST": form = CustomerForm(request.POST, instance=customer) if form.is_valid(): form.save() return redirect("create_vehicle", customer_id=customer.id) # Redirect with customer ID else: form = CustomerForm(instance=customer) return render(request, "billing/create_customer.html", {"form": form, "customer": customer}) # def create_vehicle(request, customer_id): # customer = get_object_or_404(Customer, id=customer_id) # if request.method == 'POST': # form = VehicleForm(request.POST) # if form.is_valid(): # vehicle = form.save(commit=False) # vehicle.customer = customer # vehicle.save() # # Assign a default service if available # default_service = Service.objects.first() # if default_service: # Booking.objects.create(vehicle=vehicle, service=default_service) # else: # print("⚠️ No services found! Create one before proceeding.") # return redirect('create_billing', vehicle_id=vehicle.id) # else: # form = VehicleForm() # return render(request, 'billing/create_vehicle.html', {'form': form, 'customer': customer}) @login_required def create_booking(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) if request.method == "POST": service_id = request.POST.get("service") selected_service = get_object_or_404(Service, id=service_id) # Create a new booking booking = Booking.objects.create( user=request.user, vehicle=vehicle, service=selected_service ) # Generate a billing entry automatically Billing.objects.create( booking=booking, total_cost=selected_service.cost, # Initial cost is service cost payment_method="", # Empty until user selects payment method payment_amount=0 # Empty until user pays ) return redirect("create_billing", booking_id=booking.id) # Redirect to billing return render(request, "billing/create_booking.html", { "vehicle": vehicle, "services": Service.objects.all() }) @login_required def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Get the latest booking for the vehicle latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first() if not latest_booking: return HttpResponse("No service booked for this vehicle.", status=400) booked_service = latest_booking.service parts = Part.objects.all() # Fetch available parts if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None payment_method = request.POST.get("payment_method") payment_amount = request.POST.get("payment_amount") # Calculate total cost (service + optional part cost) total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) # Create billing record billing = Billing.objects.create( booking=latest_booking, # Link to the booking instead of vehicle/service directly part=selected_part, payment_method=payment_method, payment_amount=payment_amount, total_cost=total_cost # The total cost has already been calculated ) # Redirect to invoice page (add your invoice view logic) return redirect("generate_invoice", billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts }) def generate_new_invoice_number(): """Generates a unique invoice number in the format INV-YYYYMMDD-XXX.""" today = datetime.today().strftime('%Y%m%d') # Format: YYYYMMDD last_invoice = Invoice.objects.filter(invoice_number__startswith=f"INV-{today}").order_by('-invoice_number').first() if last_invoice: last_number = int(last_invoice.invoice_number.split('-')[-1]) # Extract last number new_number = last_number + 1 else: new_number = 1 # Start with 1 if no invoices exist for today return f"INV-{today}-{new_number:03d}" # Format: INV-YYYYMMDD-001 def generate_invoice(request, billing_id): billing = Billing.objects.get(id=billing_id) # Check if an invoice already exists invoice, created = Invoice.objects.get_or_create( billing=billing, defaults={ "total_amount": billing.total_cost, # ✅ Use 'total_cost' "payment_status": "Unpaid", } ) return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing}) lets refine the views

Your views are well-structured but can be cleaned up, optimized, and made more robust. Here’s an improved version with better error handling, cleaner logic, and improved readability. 🚀

🔹 Key Improvements in This Refinement:

✅ Removed unnecessary logic (e.g., redundant get_or_create calls).
✅ Used get_object_or_404 for safety (to avoid errors if objects don’t exist).
✅ Ensured proper redirections (fixed create_billing redirection issue).
✅ Improved invoice number generation (simplified code and improved readability).

✅ Refined Views

python
from django.db import IntegrityError
from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.http import HttpResponse
from datetime import datetime
from .models import *
from .forms import *


def is_admin(user):
    return user.is_staff or user.role == "admin"


def billing_home(request):
    return render(request, "billing/home.html")


@login_required
def create_customer(request):
    """Creates or updates a customer profile linked to the logged-in user."""
    customer, created = Customer.objects.get_or_create(
        user=request.user,
        defaults={"name": request.user.username, "email": request.user.email},
    )

    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            form.save()
            return redirect("create_booking", vehicle_id=customer.vehicle.id)  # Redirect to booking

    else:
        form = CustomerForm(instance=customer)

    return render(request, "billing/create_customer.html", {"form": form, "customer": customer})


@login_required
def create_booking(request, vehicle_id):
    """Allows a customer to book a service for their vehicle."""
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    if request.method == "POST":
        service_id = request.POST.get("service")
        selected_service = get_object_or_404(Service, id=service_id)

        # Create a new booking
        booking = Booking.objects.create(
            user=request.user, vehicle=vehicle, service=selected_service
        )

        # Generate a billing entry automatically
        Billing.objects.create(
            booking=booking,
            total_cost=selected_service.cost,
            payment_method="",
            payment_amount=0,
        )

        return redirect("create_billing", booking_id=booking.id)

    return render(
        request,
        "billing/create_booking.html",
        {"vehicle": vehicle, "services": Service.objects.all()},
    )


@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id, user=request.user)
    booked_service = booking.service
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Update or create billing entry
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {"booking": booking, "booked_service": booked_service, "parts": parts},
    )


def generate_invoice_number():
    """Generates a unique invoice number in the format INV-YYYYMMDD-XXX."""
    today = datetime.today().strftime("%Y%m%d")
    last_invoice = Invoice.objects.filter(invoice_number__startswith=f"INV-{today}").order_by("-invoice_number").first()

    new_number = (int(last_invoice.invoice_number.split("-")[-1]) + 1) if last_invoice else 1
    return f"INV-{today}-{new_number:03d}"


@login_required
def generate_invoice(request, billing_id):
    """Creates and displays an invoice for a completed billing entry."""
    billing = get_object_or_404(Billing, id=billing_id)

    invoice, created = Invoice.objects.get_or_create(
        billing=billing,
        defaults={"total_amount": billing.total_cost, "payment_status": "Unpaid"},
    )

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

💡 Summary of Changes

Created a Cleaner create_customer Function
- Now redirects the user to booking instead of vehicle creation.
- Ensures customers are linked to their user accounts.
Refactored create_booking
- Uses get_object_or_404 for safe lookups.
- Directly links Booking → Billing without unnecessary extra logic.
Fixed create_billing Redirection Bug
- Billing now takes in a booking_id, making it more direct and accurate.
- update_or_create() prevents duplicate billings.
Optimized generate_invoice_number
- Made it simpler and more efficient.
Ensured generate_invoice Works Properly
- Ensures invoices are generated only when needed.

🚀 Next Steps

If needed, we can improve templates and add better UI elements.
Let me know if you want any additional features or refinements! 🎯

AttributeError at /billing/create_customer/ 'Customer' object has no attribute 'vehicle' Request Method: POST Request URL: http://127.0.0.1:8000/billing/create_customer/ Django Version: 5.1.7 Exception Type: AttributeError Exception Value: 'Customer' object has no attribute 'vehicle' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 30, in create_customer Raised during: billing.views.create_customer Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages']

The error occurs because the Customer model does not have a direct vehicle attribute. Instead, vehicles are likely related to customers through a ForeignKey or OneToMany relationship.

🔍 How to Fix This Issue

Modify the create_customer function to correctly retrieve the customer's vehicles and redirect accordingly.

✅ Fixed Code for `create_customer`

python
@login_required
def create_customer(request):
    """Creates or updates a customer profile linked to the logged-in user."""
    customer, created = Customer.objects.get_or_create(
        user=request.user,
        defaults={"name": request.user.username, "email": request.user.email},
    )

    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            form.save()

            # Fetch the latest vehicle (if exists), else redirect to vehicle creation
            latest_vehicle = customer.vehicle_set.first()  # Assuming One-to-Many (Customer → Vehicles)
            if latest_vehicle:
                return redirect("create_booking", vehicle_id=latest_vehicle.id)
            else:
                return redirect("create_vehicle", customer_id=customer.id)

    else:
        form = CustomerForm(instance=customer)

    return render(request, "billing/create_customer.html", {"form": form, "customer": customer})

🔹 Explanation of the Fix

✅ Instead of customer.vehicle, we use customer.vehicle_set.first()

This fetches the first vehicle linked to the customer.
Works only if a ForeignKey (customer = models.ForeignKey(Customer, on_delete=models.CASCADE)) exists in the Vehicle model.

✅ Redirects properly based on vehicle availability

If a vehicle exists → Redirect to service booking
If no vehicle → Redirect to vehicle creation first

🚀 Next Steps

Confirm your Vehicle model has a ForeignKey linking it to Customer:

python
class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE, related_name="vehicles")
    make = models.CharField(max_length=50)
    model = models.CharField(max_length=50)

If you named the related_name differently, change customer.vehicle_set.first() to customer.vehicles.first().
Test the fix and let me know if any issues remain! 🎯

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Book a Service</title> <style> body { font-family: Arial, sans-serif; background-color: #f8f9fa; margin: 0; padding: 0; display: flex; justify-content: center; align-items: center; height: 100vh; } .container { max-width: 500px; background: white; padding: 30px; box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1); border-radius: 8px; text-align: center; } h2 { color: #343a40; margin-bottom: 20px; } label { font-size: 16px; font-weight: bold; display: block; text-align: left; margin-top: 10px; } select { width: 100%; padding: 10px; margin-top: 5px; border: 1px solid #ced4da; border-radius: 4px; font-size: 16px; } button { background-color: #28a745; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; width: 100%; cursor: pointer; margin-top: 20px; border-radius: 4px; transition: background 0.3s ease-in-out; } button:hover { background-color: #218838; } </style> </head> <body> <div class="container"> <h2>🛠️ Book a Service for {{ vehicle.make }} {{ vehicle.model }}</h2> <form method="post"> {% csrf_token %} <label for="service">Select Service:</label> <select name="service" id="service" required> <option value="" selected>Select a Service</option> {% for service in services %} <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option> {% endfor %} </select> <button type="submit">Proceed to Billing</button> </form> </div> </body> </html> so here is a question when i booked in billing> bookings their was a service i selected lets say its oil change here in the billing shouldn't i get the same service for billing

Yes! In the billing stage, you should be seeing the same service that was selected during booking. The service should automatically be associated with the billing record.

🔍 Why is the service missing in Billing?

Booking & Service are not properly linked
- When a customer selects a service, a Booking should be created and linked to the selected service.
- The Billing should then retrieve the service from the linked Booking.
Incorrect Query in create_billing View
- You might be fetching the wrong service instead of getting it from the latest booking.

✅ Fix the `create_billing` View to Show the Booked Service

Modify your create_billing function to correctly retrieve the service from the booking:

python
@login_required
def create_billing(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service  # ✅ Retrieve the selected service
    parts = Part.objects.all()  # Fetch available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = request.POST.get("payment_amount")

        # Calculate total cost (service + optional part cost)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create billing record
        billing = Billing.objects.create(
            booking=latest_booking,  # ✅ Link to the booking (includes selected service)
            part=selected_part,
            payment_method=payment_method,
            payment_amount=payment_amount,
            total_cost=total_cost  # ✅ Use the service's cost
        )

        # Redirect to invoice page
        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booked_service": booked_service,  # ✅ Pass the selected service to the template
        "parts": parts
    })

🔹 Explanation of the Fix

✅ Correctly fetches the service → booked_service = latest_booking.service
✅ Links Billing to Booking → billing = Billing.objects.create(booking=latest_booking, ...)
✅ Passes the correct service to the billing page

Now, when you go to the billing page, the selected service from booking (e.g., Oil Change) should automatically appear.

🔎 Next Steps

Test it by booking a service and checking if the same service appears in Billing.
Let me know if you need any refinements! 🚀

@login_required def create_billing(request, booking_id): """Generates a billing record after a booking is made.""" booking = get_object_or_404(Booking, id=booking_id, user=request.user) booked_service = booking.service parts = Part.objects.all() if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None payment_method = request.POST.get("payment_method") payment_amount = float(request.POST.get("payment_amount", 0)) # Calculate total cost total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) # Update or create billing entry billing, created = Billing.objects.update_or_create( booking=booking, defaults={ "part": selected_part, "payment_method": payment_method, "payment_amount": payment_amount, "total_cost": total_cost, }, ) return redirect("generate_invoice", billing_id=billing.id) return render( request, "billing/create_billing.html", {"booking": booking, "booked_service": booked_service, "parts": parts}, ) the above is working but the select has no lattest booking also your answer which ill paste below has a greate disparity to the one i had i cannot understand @login_required def create_billing(request, vehicle_id): vehicle = get_object_or_404(Vehicle, id=vehicle_id) # Get the latest booking for the vehicle latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first() if not latest_booking: return HttpResponse("No service booked for this vehicle.", status=400) booked_service = latest_booking.service # ✅ Retrieve the selected service parts = Part.objects.all() # Fetch available parts if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None payment_method = request.POST.get("payment_method") payment_amount = request.POST.get("payment_amount") # Calculate total cost (service + optional part cost) total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) # Create billing record billing = Billing.objects.create( booking=latest_booking, # ✅ Link to the booking (includes selected service) part=selected_part, payment_method=payment_method, payment_amount=payment_amount, total_cost=total_cost # ✅ Use the service's cost ) # Redirect to invoice page return redirect("generate_invoice", billing_id=billing.id) return render(request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, # ✅ Pass the selected service to the template "parts": parts }) merge appropriately

Alright, let’s merge both versions while keeping the latest booking selection working correctly and ensuring that the billing page displays the selected service.

🛠 Key Fixes & Merging Approach:

Retrieve the latest booking (from your original approach).
Use update_or_create() to update billing if it already exists (from your version).
Pass the correct booked service to the template.

✅ Merged & Optimized `create_billing` View

python
@login_required
def create_billing(request, vehicle_id):
    """Generates or updates a billing record after a booking is made."""
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for this vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service  # ✅ Retrieve the selected service
    parts = Part.objects.all()  # Fetch available parts

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost (service + optional part cost)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Update or create billing entry
        billing, created = Billing.objects.update_or_create(
            booking=latest_booking,  # ✅ Ensure billing is linked to the latest booking
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booking": latest_booking,  # ✅ Ensuring the latest booking is passed to the template
        "booked_service": booked_service,  # ✅ Show the correct service
        "parts": parts
    })

🔹 What's Fixed & Merged?

✅ Uses vehicle_id to find the latest booking.
✅ Ensures selected service appears in billing.
✅ Uses update_or_create() to avoid duplicate billing.
✅ Properly handles optional parts selection.

📌 Next Steps

Test by booking a service and checking if it automatically appears in billing.
Ensure that the correct service is displayed in billing.
Let me know if anything needs refining! 🚀

Let's debug the issue step by step to make sure the booked service appears correctly in billing.

✅ Step 1: Print Debugging in `create_billing`

Modify your create_billing view to print key data before rendering the template.

python
@login_required
def create_billing(request, vehicle_id):
    """Generates or updates a billing record after a booking is made."""
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for this vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()
    
    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service  # ✅ Retrieve the selected service
    parts = Part.objects.all()  # Fetch available parts

    # DEBUGGING: Print retrieved values
    print(f"Vehicle: {vehicle.make} {vehicle.model}")
    print(f"Latest Booking: {latest_booking}")
    print(f"Booked Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost (service + optional part cost)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Update or create billing entry
        billing, created = Billing.objects.update_or_create(
            booking=latest_booking,  # ✅ Ensure billing is linked to the latest booking
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(request, "billing/create_billing.html", {
        "vehicle": vehicle,
        "booking": latest_booking,  # ✅ Ensuring the latest booking is passed to the template
        "booked_service": booked_service,  # ✅ Show the correct service
        "parts": parts
    })

✅ Step 2: Check Console Logs

Restart your Django server (python manage.py runserver).
Go to the billing page in your browser.
Look at the Django terminal logs to check if the booked service is printed.

You should see:

yaml
Vehicle: Toyota Corolla
Latest Booking: Booking object (12)
Booked Service: Oil Change - KSH 2000

If the booked service is missing, there could be an issue with how the booking is created.

✅ Step 3: Verify Booking Creation

Check if the Booking model is correctly saving the service. Run this command in Django shell:

sh
python manage.py shell

Then, check the latest booking:

python
from billing.models import Booking

latest_booking = Booking.objects.order_by('-created_at').first()
print(latest_booking.service)  # This should NOT be None

If latest_booking.service is None, the service is not saved.
If latest_booking.service has a value, check why it's not appearing in the template.

✅ Step 4: Fix the Template (If Needed)

Make sure create_billing.html displays the booked service:

html
<h3>Selected Service: {{ booked_service.name }} - KSH {{ booked_service.cost }}</h3>

🛠 If the Issue Persists

Confirm that create_booking() correctly saves the selected service.
Make sure the service field exists in Booking model.
Check if there's any overridden logic preventing it from displaying.

Try these steps and let me know what prints in the logs! 🚀

billing, created = Billing.objects.update_or_create( booking=latest_booking, # ✅ Ensure billing is linked to the latest booking defaults={ "part": selected_part, "payment_method": payment_method, "payment_amount": payment_amount, "total_cost": total_cost, }, ) created cannot be accessed by pylance

The created variable in update_or_create() is correctly used in Django, but Pylance might not recognize it due to type inference issues.

✅ Solution 1: Explicitly Ignore Pylance Warning

You can tell Pylance to ignore the issue by adding a type hint:

python
from typing import Tuple

billing_tuple: Tuple[Billing, bool] = Billing.objects.update_or_create(
    booking=latest_booking,
    defaults={
        "part": selected_part,
        "payment_method": payment_method,
        "payment_amount": payment_amount,
        "total_cost": total_cost,
    },
)

billing, created = billing_tuple  # Now, Pylance should not complain

✅ Solution 2: Check Pylance Settings

If the warning persists, Pylance might be strict about type inference. You can disable strict type checking:

Open VS Code Settings (Ctrl + ,).
Search for "pylance" and find "Type Checking Mode".
Set it to "basic" instead of "strict".

✅ Solution 3: Use a Simple Workaround

If Pylance still marks created as inaccessible, you can unpack it separately:

python
result = Billing.objects.update_or_create(
    booking=latest_booking,
    defaults={
        "part": selected_part,
        "payment_method": payment_method,
        "payment_amount": payment_amount,
        "total_cost": total_cost,
    },
)

billing = result[0]  # First item is the Billing object
created = result[1]  # Second item is the boolean (True/False)

This should resolve Pylance's issue without affecting your Django logic. 🚀

create_billing.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Billing for {{ vehicle.make }} {{ vehicle.model }}</title> <style> body { font-family: Arial, sans-serif; background-color: #f4f4f9; margin: 0; padding: 0; } .container { width: 60%; margin: 30px auto; background-color: #fff; padding: 30px; box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1); border-radius: 8px; } h1 { text-align: center; color: #333; } label { font-size: 16px; color: #333; } .info { background: #f0f0f0; padding: 10px; border-radius: 5px; margin-bottom: 15px; } button { background-color: #4CAF50; color: white; font-weight: bold; border: none; padding: 12px; font-size: 16px; cursor: pointer; transition: background-color 0.3s ease; border-radius: 4px; } button:hover { background-color: #45a049; } </style> </head> <body> <div class="container"> <h1>Billing for {{ vehicle.make }} {{ vehicle.model }}</h1> <div class="info"> <p><strong>Service:</strong> {{ booked_service.name }}</p> <p><strong>Service Cost:</strong> KSH {{ booked_service.cost }}</p> </div> <form method="post"> {% csrf_token %} {% if parts %} <label for="part">Select Part (Optional):</label> <select name="part" id="part"> <option value="" selected>Select a Part</option> {% for part in parts %} <option value="{{ part.id }}">{{ part.name }} - KSH {{ part.cost }}</option> {% endfor %} </select> <br><br> {% endif %} <label for="payment_method">Payment Method</label> <input type="text" name="payment_method" id="payment_method" required> <label for="payment_amount">Payment Amount</label> <input type="number" name="payment_amount" id="payment_amount" required> <br><br> <button type="submit">Proceed to Invoice</button> </form> </div> </body> </html>

Your create_billing.html template looks great! However, if the booked service is not displaying, the issue might be in how booked_service is passed in the views.py file.

🛠 Debugging Steps

1️⃣ Check if `booked_service` is available in the context

Modify your view to print the values before rendering:

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id, user=request.user)
    
    booked_service = booking.service if booking else None
    parts = Part.objects.all()

    # Debugging: Print to terminal to confirm values
    print(f"Booking ID: {booking.id}")
    print(f"Booked Service: {booked_service}")  # Check if this prints a valid service

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Update or create billing entry
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "booking": booking,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

➡ Run the server, go to the billing page, and check the terminal for the debug output.

2️⃣ Ensure the booking contains a valid service

If booked_service is None, check the database:

Open Django shell in your terminal:
```
sh
python manage.py shell
```

Run this query:

python
from billing.models import Booking
booking = Booking.objects.first()  # Fetch a booking
print(booking.service)  # Check if service exists

➡ If this prints None, the issue is that the service was not assigned when booking. You may need to update the create_booking() function to ensure a service is properly attached.

3️⃣ Fix `create_booking()` if Needed

If the service is missing in the Booking, update your create_booking() function:

python
@login_required
def create_booking(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    if request.method == "POST":
        service_id = request.POST.get("service")
        selected_service = get_object_or_404(Service, id=service_id)

        # Ensure a service is always linked to a booking
        if not selected_service:
            return HttpResponse("Error: No service selected.", status=400)

        booking = Booking.objects.create(
            user=request.user,
            vehicle=vehicle,
            service=selected_service  # ✅ Assign service
        )

        return redirect("create_billing", booking_id=booking.id)

    return render(request, "billing/create_booking.html", {
        "vehicle": vehicle,
        "services": Service.objects.all()
    })

🎯 Final Thoughts

If booked_service is still not appearing, the issue is likely in the database.
Run the debugging steps, and let me know what the Django shell output says. 🚀

[01/Apr/2025 20:14:18] "GET /billing/create_customer/ HTTP/1.1" 200 2536 [01/Apr/2025 20:14:19] "GET /billing/create_customer/ HTTP/1.1" 200 2536 [01/Apr/2025 20:14:21] "POST /billing/create_customer/ HTTP/1.1" 302 0 [01/Apr/2025 20:14:21] "GET /billing/create_booking/1/ HTTP/1.1" 200 2276 [01/Apr/2025 20:14:23] "GET /billing/create_booking/1/ HTTP/1.1" 200 2276 Not Found: /favicon.ico [01/Apr/2025 20:14:24] "GET /favicon.ico HTTP/1.1" 404 6797

Your logs show that:

Customer creation (/billing/create_customer/) is working fine.
- A POST request (302 redirect) indicates successful form submission.
- The user is redirected to create_booking/1/, meaning a new booking was created for vehicle ID 1.
Booking page (/billing/create_booking/1/) is loading correctly.
- You accessed the page twice (GET requests, status 200).
Issue: favicon.ico not found (404 error)
- This is not critical. The browser is just looking for a favicon.
- Solution: Add this in <head> of your templates:
```
html
<link rel="icon" href="data:,">
```

🚀 Next Step: Debug `create_billing()`

Since create_booking/1/ is loading, but you are not seeing the booked service in create_billing.html, let's verify if the booking actually contains a service.

🛠 Debug with Django Shell

Run:

sh
python manage.py shell

Then:

python
from billing.models import Booking

# Check the latest booking
latest_booking = Booking.objects.order_by('-created_at').first()
print(f"Booking ID: {latest_booking.id}")
print(f"Vehicle: {latest_booking.vehicle}")
print(f"Service: {latest_booking.service}")  # <== Is this None?

➡ What does this print? If Service is None, the problem is in the booking creation process.

🔧 If Booking Has No Service, Fix `create_booking()`

Make sure the booking always assigns a service:

python
@login_required
def create_booking(request, vehicle_id):
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    if request.method == "POST":
        service_id = request.POST.get("service")
        selected_service = get_object_or_404(Service, id=service_id)

        booking = Booking.objects.create(
            user=request.user,
            vehicle=vehicle,
            service=selected_service  # ✅ Ensure the service is assigned
        )

        return redirect("create_billing", booking_id=booking.id)

    return render(request, "billing/create_booking.html", {
        "vehicle": vehicle,
        "services": Service.objects.all()
    })

📌 Action Plan

Check Django shell output for the Booking service.
If service is None, update create_booking().
Restart the server and test again. 🚀

Let me know what you find!

Your latest booking has a service, so the issue is not with the booking creation process.

Now, let’s check why the service is not appearing in create_billing.html.

🔍 Debug: Is `booked_service` Being Passed to the Template?

Add this debug statement in your create_billing view before rendering the template:

python
print(f"Debug - Booked Service: {booked_service.name} - KSH {booked_service.cost}")

Your full view should look like this:

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id, user=request.user)
    booked_service = booking.service  # ✅ This should not be None
    parts = Part.objects.all()

    print(f"Debug - Booked Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Update or create billing entry
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {"booking": booking, "booked_service": booked_service, "parts": parts},
    )

🛠 Next Steps

Restart your Django server and go to the billing page.
Check the terminal logs.
- If you see "Debug - Booked Service: Basic Maintenance - KSH 5000.00", the service is correctly fetched.
- If it's missing, something is wrong with how booked_service is passed.

Let me know what prints! 🚀

[01/Apr/2025 20:33:42] "GET /billing/create_customer/ HTTP/1.1" 200 2536 [01/Apr/2025 20:33:43] "GET /billing/create_customer/ HTTP/1.1" 200 2536 [01/Apr/2025 20:33:45] "POST /billing/create_customer/ HTTP/1.1" 302 0 [01/Apr/2025 20:33:45] "GET /billing/create_booking/1/ HTTP/1.1" 200 2276 [01/Apr/2025 20:34:06] "POST /billing/create_booking/1/ HTTP/1.1" 302 0 Debug - Booked Service: Basic Maintenance - KSH 5000.00 [01/Apr/2025 20:34:06] "GET /billing/create_billing/8/ HTTP/1.1" 200 2071 the service is not bringing the lattest booking have just selected the basic maintenanvcw

Alright! Since the debug log correctly shows the booked service (Basic Maintenance - KSH 5000.00), but it isn’t reflecting the latest booking, let’s double-check how we fetch the latest booking.

🔍 Issue: Are We Getting the Latest Booking?

Right now, your create_billing function retrieves the booking like this:

python
booking = get_object_or_404(Booking, id=booking_id, user=request.user)

This means it only fetches the booking by ID, not necessarily the latest one.

✅ Fix: Always Use the Latest Booking

Modify the function to fetch the latest booking for the vehicle instead of using booking_id:

Updated `create_billing` View

python
@login_required
def create_billing(request, vehicle_id):
    """Generates a billing record after a booking is made."""
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # ✅ Get the latest booking for the vehicle
    latest_booking = (
        Booking.objects.filter(vehicle=vehicle, user=request.user)
        .order_by("-created_at")
        .first()
    )

    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service  # ✅ This should be the latest service
    parts = Part.objects.all()

    print(f"Debug - Latest Booking ID: {latest_booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # ✅ Ensure total cost includes the latest booking's service
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        billing, created = Billing.objects.update_or_create(
            booking=latest_booking,  # ✅ Attach to latest booking
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,  # ✅ Now always the latest
            "parts": parts,
        },
    )

🔄 What This Fix Does

Fetches the latest booking for the vehicle (order_by("-created_at").first()).
Always uses the most recent booked service.
Ensures the billing is linked to the latest booking, not just a random one.

🚀 Next Steps

Restart your server (Ctrl + C → python manage.py runserver).
Try booking a new service.
Check the logs for Debug - Latest Booking ID: X, Service: Y.

Let me know what you see! 🚀

If created is not being recognized by Pylance in this line:

python
billing, created = Billing.objects.update_or_create(

then it’s likely that your linter is not correctly identifying tuple unpacking from update_or_create(). However, this does not affect the actual execution of the code.

✅ How to Fix Pylance Warning

Option 1: Explicitly Define the Return Values

Modify your code like this to explicitly unpack the tuple in a way Pylance understands:

python
result = Billing.objects.update_or_create(
    booking=latest_booking,
    defaults={
        "part": selected_part,
        "payment_method": payment_method,
        "payment_amount": payment_amount,
        "total_cost": total_cost,
    },
)

billing, created = result  # ✅ Explicit unpacking

This should remove the Pylance warning.

Option 2: Use Type Hinting

Sometimes, Pylance struggles to infer return types from update_or_create(). Adding a type hint may help:

python
from typing import Tuple

result: Tuple[Billing, bool] = Billing.objects.update_or_create(
    booking=latest_booking,
    defaults={
        "part": selected_part,
        "payment_method": payment_method,
        "payment_amount": payment_amount,
        "total_cost": total_cost,
    },
)

billing, created = result

🛠️ Why Does This Happen?

update_or_create() returns a tuple: (instance, created)
Pylance sometimes fails to recognize tuple unpacking
Explicit unpacking or type hinting helps Pylance understand the structure

This should fix the issue—let me know if you still see the warning! 🚀

@login_required def create_billing(request, vehicle_id): """Generates a billing record after a booking is made.""" vehicle = get_object_or_404(Vehicle, id=vehicle_id) # ✅ Get the latest booking for the vehicle latest_booking = ( Booking.objects.filter(vehicle=vehicle, user=request.user) .order_by("-created_at") .first() ) if not latest_booking: return HttpResponse("No service booked for this vehicle.", status=400) booked_service = latest_booking.service # ✅ This should be the latest service parts = Part.objects.all() print(f"Debug - Latest Booking ID: {latest_booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}") if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None payment_method = request.POST.get("payment_method") payment_amount = float(request.POST.get("payment_amount", 0)) # ✅ Ensure total cost includes the latest booking's service total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) billing, created = Billing.objects.update_or_create( booking=latest_booking, # ✅ Attach to latest booking defaults={ "part": selected_part, "payment_method": payment_method, "payment_amount": payment_amount, "total_cost": total_cost, }, ) return redirect("generate_invoice", billing_id=billing.id) return render( request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, # ✅ Now always the latest "parts": parts, }, ) show full code with modification

Here’s your fully modified and optimized create_billing function, including the fixes for:

Ensuring the latest booking is retrieved correctly
Fixing tuple unpacking issue (created variable for Pylance)
Better debugging logs

✅ Full Code for `create_billing`

python
from django.shortcuts import render, get_object_or_404, redirect
from django.http import HttpResponse
from django.contrib.auth.decorators import login_required
from billing.models import Vehicle, Booking, Part, Billing

@login_required
def create_billing(request, vehicle_id):
    """Generates a billing record after a booking is made."""
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # ✅ Get the latest booking for the vehicle
    latest_booking = (
        Booking.objects.filter(vehicle=vehicle, user=request.user)
        .order_by("-created_at")
        .first()
    )

    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service  # ✅ Get the latest service
    parts = Part.objects.all()

    # ✅ Debugging log to verify latest booking details
    print(f"Debug - Latest Booking ID: {latest_booking.id}, Vehicle: {vehicle.make} {vehicle.model}")
    print(f"Debug - Booked Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # ✅ Calculate total cost (service + optional part)
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # ✅ Fix tuple unpacking issue for Pylance
        result = Billing.objects.update_or_create(
            booking=latest_booking,  # ✅ Attach to latest booking
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )
        billing, created = result  # ✅ Explicit unpacking

        # ✅ Debugging log
        print(f"Debug - Billing {'Created' if created else 'Updated'}: {billing.id}, Total Cost: KSH {billing.total_cost}")

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,  # ✅ Now always shows the latest service
            "parts": parts,
        },
    )

🔧 Key Fixes & Improvements

Fixed the issue where the latest service wasn't appearing
- Now explicitly fetching the latest Booking using .order_by("-created_at").first()
Fixed created not being recognized by Pylance
- Used explicit tuple unpacking with result = Billing.objects.update_or_create(...)
- Then extracted values: billing, created = result
Improved debugging logs
- Added logs to check if latest_booking is retrieved correctly
- Confirming if billing is created or updated

✅ What to Do Next?

Run the function and check your logs
- If you see "Debug - Booked Service: ...", then it’s working correctly.
Test it by making multiple bookings and confirm it always fetches the latest one.

Let me know if you still face any issues! 🚀

The fact that every user is getting "Basic Maintenance - KSH 5000" suggests that the service is being hardcoded or defaulted to "Basic Maintenance" when the billing is being created. This could happen for several reasons, such as:

Possible Reasons:

Hardcoded Value in the Database:
- "Basic Maintenance" could be a default service assigned to bookings that don't have any specific service chosen by the user.
- It could also be the first service created in the database and is getting selected automatically because it is the first service in the queryset.
Service Not Assigned Properly:
- When creating a new booking or a new service, the service field may not be set correctly or is set to the default, which is "Basic Maintenance".
Misconfiguration of the Booking Process:
- If the user doesn't select a service (or if there is no validation or handling of missing services), the service could default to "Basic Maintenance."

Debugging Steps:

1. Check the Service Assignment in `Booking` Creation

Ensure that when creating a booking for a user, the service is correctly assigned.
In your view where the booking is created, make sure the service field is getting populated properly.

For example:

python
# When creating a booking, make sure the correct service is being assigned
booked_service = request.POST.get("service")
if not booked_service:
    # Handle case when service isn't selected (or assign default)
    booked_service = Service.objects.first()  # This could be "Basic Maintenance"

2. Check the Queryset for Services

If you fetch services from the database like this:

python
booked_service = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by("-created_at").first().service

Check to see which service is returned. If there’s no specific service for the user, it could default to the first service.

Fix: Make sure that if no service is assigned, it falls back to the correct logic and doesn’t assign "Basic Maintenance" as a fallback unless you intend it.

3. Database Check:

Check the data in your Service table to see what entries are there.
You can run:

python
from billing.models import Service
services = Service.objects.all()
for service in services:
    print(f"{service.name} - KSH {service.cost}")

If "Basic Maintenance" is the first or default service, it will show up if no other service is selected by the user.

4. Check Default Values in Forms (if using a form)

If you use a form to create a booking, make sure the default value for the service is not set to "Basic Maintenance".

Quick Fix Example:

If you want to ensure that the "Basic Maintenance" service is only used when no other service is chosen:

python
booked_service = latest_booking.service or Service.objects.first()  # Ensure that the service is not None

Or, if you're not assigning a service directly:

python
# If no service is selected, we assign a default service
if not latest_booking.service:
    booked_service = Service.objects.first()  # Optional, make sure to handle it as needed

Conclusion:

Investigate the Service Assignment in your booking process to ensure the correct service is being set.
Check the Queryset & Database to understand why "Basic Maintenance" might be selected by default.
Ensure the User is Correctly Choosing a Service and that the service is being passed correctly into the booking process.

From the output, it looks like "Basic Maintenance - KSH 5000" is the only service in your Service table. This is why it’s always being selected as the service for every booking.

How to Fix:

Add More Services:
- If you intended to have multiple services, you should add additional services to your database.
- For example, you could add services like "Oil Change", "Tire Replacement", etc., through the Django admin panel or by creating a data migration.
To add services via the Django shell:
```
python
from billing.models import Service

# Create a new service
service = Service.objects.create(name="Oil Change", cost=3000)
print(f"Added service: {service.name} - KSH {service.cost}")
```
Check Service Assignment in the View:
- Ensure that the service selected by the user is properly assigned to the booking when creating a new booking. If there’s no user selection, the system will use the first service found (which is "Basic Maintenance").
Example Fix for Service Selection:
```
python
booked_service = request.POST.get("service")  # Make sure this comes from a form selection
if not booked_service:
    booked_service = Service.objects.first()  # Default to first service if none selected
```
Consider Default Services:
- If you want to use "Basic Maintenance" as a default service only when no other service is selected, make sure the default logic is implemented when the user doesn’t select a service.

By adding more services, you’ll prevent "Basic Maintenance" from being the only option, which will solve the issue you're experiencing.

To check the details saved in the Billing table in your Django database, you can run the following commands in the Django shell:

Open Django shell:
```
bash
python manage.py shell
```

Import the Billing model:

python
from billing.models import Billing

Query all billing records:

python
billings = Billing.objects.all()
for billing in billings:
    print(f"ID: {billing.id}, Booking: {billing.booking.id}, Service: {billing.booking.service.name}, Part: {billing.part.name if billing.part else 'None'}, Payment Method: {billing.payment_method}, Payment Amount: {billing.payment_amount}, Total Cost: {billing.total_cost}")

This will display all the Billing records in the database with the relevant details, such as:

Booking ID
Service Name (linked to the booking)
Part Name (if any part was added)
Payment Method
Payment Amount
Total Cost

Check for specific billing details: If you want to check a specific billing entry, you can do this:

python
billing = Billing.objects.get(id=1)  # Replace 1 with the billing ID you want to check
print(f"ID: {billing.id}, Booking: {billing.booking.id}, Service: {billing.booking.service.name}, Part: {billing.part.name if billing.part else 'None'}, Payment Method: {billing.payment_method}, Payment Amount: {billing.payment_amount}, Total Cost: {billing.total_cost}")

This will give you the exact data stored in the Billing table, which can help you identify any issues with the way services, parts, and billing details are being saved.

To check the details saved for a Customer in your database, follow the steps below in the Django shell:

Open Django shell:
```
bash
python manage.py shell
```

Import the Customer model:

python
from billing.models import Customer

Query all customers: You can check all the customer records saved in your database by running:
```
python
customers = Customer.objects.all()
for customer in customers:
    print(f"ID: {customer.id}, Name: {customer.name}, Email: {customer.email}, Vehicle: {customer.vehicle.make} {customer.vehicle.model}")
```
This will display all the Customer records, including details like:
- Customer ID
- Customer Name
- Customer Email
- Associated Vehicle Make and Model (if related)

Check for specific customer details: If you want to see the details of a specific customer, you can retrieve a customer by ID (or any other field):

python
customer = Customer.objects.get(id=1)  # Replace 1 with the customer ID you want to check
print(f"ID: {customer.id}, Name: {customer.name}, Email: {customer.email}, Vehicle: {customer.vehicle.make} {customer.vehicle.model}")

This will show you the details of that particular customer.

Check customer vehicle details (if applicable): If your Customer model is linked to a Vehicle model, you can also check the related vehicle data by accessing the vehicle attribute:
```
python
for customer in customers:
    print(f"Customer: {customer.name}, Vehicle: {customer.vehicle.make} {customer.vehicle.model}")
```

This should give you a comprehensive view of your customer data stored in the database, including the linked vehicle information, if applicable.

>>> from billing.models import Customer >>> customers = Customer.objects.all() >>> for customer in customers: ... print(f"ID: {customer.id}, Name: {customer.name}, Email: {customer.email}, Vehicle: {customer.vehicle.make} {customer.vehicle.model}") ... Traceback (most recent call last): File "<console>", line 2, in <module> AttributeError: 'Customer' object has no attribute 'vehicle' >>>

The error indicates that the Customer model does not have a direct vehicle attribute or the relationship between Customer and Vehicle is not set up correctly.

Here are a few possible reasons and solutions for this issue:

1. Check the Relationship between `Customer` and `Vehicle`

If your Customer model has a relationship to Vehicle, it might be a ForeignKey, OneToOneField, or a ManyToManyField. Let's inspect the relationship between Customer and Vehicle.

In the Django shell, run:

python
from billing.models import Customer
print(Customer._meta.get_fields())

This will give you all the fields of the Customer model. Look for something like vehicle, vehicles, or similar.

If you see that vehicle is not directly in the Customer model, but the relationship is something else (like vehicle_set for a reverse ForeignKey), we can handle that.

2. If Using a ForeignKey or OneToOneField

If the Customer model has a ForeignKey or OneToOneField relationship to Vehicle, you might need to access it differently. For example:

For a ForeignKey: If the Customer model has a ForeignKey field like:

python
vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)

You can access the vehicle like this:

python
print(f"Customer: {customer.name}, Vehicle: {customer.vehicle.make} {customer.vehicle.model}")

For a OneToOneField: If the Customer model has a OneToOneField like:
```
python
vehicle = models.OneToOneField(Vehicle, on_delete=models.CASCADE)
```
The access method will be the same as above.

3. If Using a Reverse Relationship (e.g., `vehicle_set`)

If the relationship is the other way around (i.e., a Vehicle has a ForeignKey to Customer), you may need to access the vehicles from the Vehicle model like this:

python
vehicle = customer.vehicle_set.first()  # This gets the first related vehicle if it's a reverse relationship
print(f"Customer: {customer.name}, Vehicle: {vehicle.make} {vehicle.model}")

4. Update Query to Print Correctly

Once you've confirmed the exact relationship, you can adjust your query accordingly. For example, if Customer has a ForeignKey to Vehicle, your query will look like:

python
customers = Customer.objects.all()
for customer in customers:
    vehicle = customer.vehicle  # Assuming there's a ForeignKey or OneToOneField
    print(f"ID: {customer.id}, Name: {customer.name}, Email: {customer.email}, Vehicle: {vehicle.make} {vehicle.model}")

Let me know if this helps or if you need further clarification!

AttributeError: 'Customer' object has no attribute 'vehicle' >>> from billing.models import Customer >>> print(Customer._meta.get_fields()) (<ManyToOneRel: billing.vehicle>, <django.db.models.fields.BigAutoField: id>, <django.db.models.fields.related.OneToOneField: user>, <django.db.models.fields.CharField: name>, <django.db.models.fields.EmailField: email>, <django.db.models.fields.CharField: phone>) >>> >>>

It looks like the Customer model doesn't directly have a vehicle field, but it has a reverse relationship to the Vehicle model through a ManyToOneRel (reverse relation). This means the Customer model does not directly store the vehicle, but you can access the associated vehicles through the reverse relationship.

Given the ManyToOneRel, we can use the reverse lookup to access the related Vehicle model from Customer. It seems the related name for Customer in the Vehicle model is likely vehicle_set.

Here's how you can modify the code to access the vehicle information:

Accessing Vehicle Information for a Customer:

python
from billing.models import Customer

customers = Customer.objects.all()
for customer in customers:
    # Access related vehicle(s) through reverse relation (vehicle_set)
    vehicle = customer.vehicle_set.first()  # Assuming a customer can have multiple vehicles, take the first one.
    
    if vehicle:  # If the customer has a vehicle
        print(f"ID: {customer.id}, Name: {customer.name}, Email: {customer.email}, Vehicle: {vehicle.make} {vehicle.model}")
    else:
        print(f"ID: {customer.id}, Name: {customer.name}, Email: {customer.email}, Vehicle: No Vehicle Assigned")

Explanation:

The vehicle_set is automatically created by Django when you use a ForeignKey from Vehicle to Customer. This is the reverse relationship, meaning that you can access all vehicles related to a given customer.
We use .first() to get the first associated vehicle, but if a customer can have more than one vehicle, you can use .all() or other methods to filter as needed.

If vehicle_set is empty, the code will print "No Vehicle Assigned", indicating that this particular customer does not have an associated vehicle.

This should now allow you to properly display the associated vehicle(s) for each customer. Let me know if you have any further questions or if you'd like to explore this further!

To access and interact with the core Booking model from your Django app using the Django shell, you can use the following steps:

Step-by-step instructions:

Enter Django Shell: First, open your command line or terminal and navigate to your Django project directory. Then, run the following command to access the Django shell:
```
bash
python manage.py shell
```
Import the Models: Once inside the Django shell, you can import the Booking model and any other models you need to interact with.
```
python
from billing.models import Booking, Customer, Vehicle
```

Access Booking Data: You can now interact with the Booking model. Here are a few examples of what you can do:

Get all bookings:

python
bookings = Booking.objects.all()
for booking in bookings:
    print(f"Booking ID: {booking.id}, Service: {booking.service.name}, Vehicle: {booking.vehicle.make} {booking.vehicle.model}")

Get a specific booking by ID:

python
booking = Booking.objects.get(id=1)  # Replace '1' with the desired ID
print(f"Booking ID: {booking.id}, Vehicle: {booking.vehicle.make} {booking.vehicle.model}, Service: {booking.service.name}")

Get the latest booking for a specific user and vehicle:

python
latest_booking = Booking.objects.filter(vehicle__id=1, user__id=1).order_by('-created_at').first()  # Replace with actual IDs
if latest_booking:
    print(f"Latest Booking ID: {latest_booking.id}, Service: {latest_booking.service.name}")
else:
    print("No bookings found for this vehicle and user.")

Access the Customer associated with a booking:

python
booking = Booking.objects.get(id=1)  # Replace with desired booking ID
customer = booking.user  # Assuming a One-to-One relation with the `User` model
print(f"Customer Name: {customer.name}, Email: {customer.email}")

Access the vehicle associated with a booking:

python
booking = Booking.objects.get(id=1)  # Replace with desired booking ID
vehicle = booking.vehicle  # Assuming a ForeignKey relation with the `Vehicle` model
print(f"Vehicle: {vehicle.make} {vehicle.model}, Plate: {vehicle.registration_number}")

Perform Queries Based on Specific Conditions: You can filter bookings by other fields, such as date, service, or vehicle, like this:

python
bookings_today = Booking.objects.filter(created_at__date='2025-04-01')  # Replace with the desired date
for booking in bookings_today:
    print(f"Booking ID: {booking.id}, Service: {booking.service.name}")

Exit the Django Shell: To exit the Django shell, you can type:
```
python
exit()
```

Common Queries for `Booking`:

Get all bookings for a specific vehicle:

python
bookings = Booking.objects.filter(vehicle__id=1)  # Replace with the correct vehicle ID

Get all bookings for a specific customer:

python
bookings = Booking.objects.filter(user__id=1)  # Replace with the correct customer ID

Get bookings for a specific service:

python
bookings = Booking.objects.filter(service__id=1)  # Replace with the correct service ID

These are the basic steps for interacting with the Booking model and related data in your Django shell. If you need any further guidance or have specific queries, feel free to ask!

To clarify, based on the details you provided:

Customer Name: "Sly Mwende"
Email: "sylvia@gmail.com"
Service: "Oil Change"
Booking Status: "Pending"
Booking Date: "April 11, 2025"

This information seems to be stored in the Booking table in your Django app's database, which would be in the core table (or whatever app you have defined for the bookings). Here's how you can confirm that this data is correctly saved in your database and retrieve it via Django shell:

Step 1: Verify the Data in the Admin Panel (Optional)

You can first check if the data is saved properly in your Django Admin interface (assuming it's configured). You should look under the Bookings section in the admin panel to verify that the correct details are listed for "Sly Mwende."

Step 2: Query the Data via Django Shell

To confirm that the data is stored in the Booking model, you can query the Booking model through Django shell like this:

Open the Django shell by running:
```
bash
python manage.py shell
```

Import the necessary models:

python
from billing.models import Booking, Service, Customer

Query for the Booking record where the customer and service match:

python
booking = Booking.objects.filter(user__email="sylvia@gmail.com", service__name="Oil Change").first()

Now, you can print out the details of the booking:

python
if booking:
    print(f"Booking ID: {booking.id}")
    print(f"Customer Name: {booking.user.name}")
    print(f"Customer Email: {booking.user.email}")
    print(f"Service: {booking.service.name}")
    print(f"Status: {booking.status}")
    print(f"Booking Date: {booking.created_at}")
else:
    print("No matching booking found.")

This will print out the details of the booking based on the provided information.

Step 3: Check the Related Models

If the Booking model has a ForeignKey to the Customer model, you can also print out the customer’s details. For example:

python
customer = booking.user  # assuming a ForeignKey relationship with the `User` model
print(f"Customer: {customer.name}, Email: {customer.email}")

Step 4: Verify the Status

You mentioned the status is "Pending." If the Booking model has a field for status, you can verify its value:

python
print(f"Booking Status: {booking.status}")  # Assuming there's a 'status' field

Additional Query to Verify All Bookings for a Specific Date

If you want to check all bookings for April 11, 2025 (or any other date), you can query like this:

python
from django.utils import timezone

# Specify the date you want to filter for (e.g., April 11, 2025)
booking_date = timezone.datetime(2025, 4, 11).date()

bookings = Booking.objects.filter(created_at__date=booking_date)
for booking in bookings:
    print(f"Booking ID: {booking.id}, Customer: {booking.user.name}, Service: {booking.service.name}, Status: {booking.status}")

This will retrieve all bookings that were created on April 11, 2025.

Summary:

You can query your Booking model to find the exact details saved.
Use the Django shell to query the database for relevant records.
Verify related fields such as customer name, email, service name, status, and the booking date.

If you have any more questions or need further help with this, feel free to ask!

TypeError at /billing/create_billing/9/ create_billing() got an unexpected keyword argument 'booking_id' Request Method: GET Request URL: http://127.0.0.1:8000/billing/create_billing/9/ Django Version: 5.1.7 Exception Type: TypeError Exception Value: create_billing() got an unexpected keyword argument 'booking_id' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\auth\decorators.py, line 60, in _view_wrapper Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages']

The error you're encountering, TypeError: create_billing() got an unexpected keyword argument 'booking_id', suggests that Django is passing an unexpected argument to your create_billing view function. Specifically, it seems the URL configuration is passing a booking_id to the view, but your create_billing function is expecting a vehicle_id.

Here's how to fix this:

Step 1: Review Your URL Configuration

Check how your URL is defined in the urls.py for the create_billing view. The issue seems to be that you're passing booking_id instead of vehicle_id.

If your URL pattern is defined like this:

python
path('create_billing/<int:booking_id>/', views.create_billing, name='create_billing'),

It expects a booking_id argument, but your view is not set up to handle this. Instead, it is expecting vehicle_id.

Step 2: Modify the View Function to Accept `booking_id`

If you intend to use booking_id in your create_billing view, you should modify the view to accept booking_id instead of vehicle_id. Here’s how you can do that:

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    print(f"Debug - Booking ID: {booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Step 3: Update the URL Pattern (Optional)

If you intend to use vehicle_id instead of booking_id, you should update both the URL and view function. For example:

Change your URL pattern to:

python
path('create_billing/<int:vehicle_id>/', views.create_billing, name='create_billing'),

Then modify the view to look up the vehicle_id instead:

python
@login_required
def create_billing(request, vehicle_id):
    """Generates a billing record after a booking is made."""
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Get the latest booking for the vehicle
    latest_booking = Booking.objects.filter(vehicle=vehicle, user=request.user).order_by('-created_at').first()

    if not latest_booking:
        return HttpResponse("No service booked for this vehicle.", status=400)

    booked_service = latest_booking.service
    parts = Part.objects.all()

    print(f"Debug - Latest Booking ID: {latest_booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        billing, created = Billing.objects.update_or_create(
            booking=latest_booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Step 4: Clear Up URL Conflicts

Ensure that the URL is defined correctly in your urls.py file:

python
urlpatterns = [
    path('create_billing/<int:vehicle_id>/', views.create_billing, name='create_billing'),
]

Make sure that the argument passed in the URL (vehicle_id or booking_id) matches the function’s argument.

Summary:

The TypeError happens because the URL is passing booking_id but your view is set up to accept vehicle_id.
If you want to use booking_id, modify the view to accept it and work with it, or change your URL configuration to pass vehicle_id if that is your intended use.

Let me know if you need further assistance!

IntegrityError at /billing/generate_invoice/6/ UNIQUE constraint failed: billing_invoice.invoice_number Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/6/ Django Version: 5.1.7 Exception Type: IntegrityError Exception Value: UNIQUE constraint failed: billing_invoice.invoice_number Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py, line 354, in execute Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Tue, 01 Apr 2025 18:06:41 +0000

The error IntegrityError: UNIQUE constraint failed: billing_invoice.invoice_number suggests that when generating the invoice, you're trying to insert a new record with an invoice_number that already exists in the database. The invoice_number field is set to be unique, meaning no two invoices can share the same number.

Steps to Fix:

Ensure Unique Invoice Number:
- You need to ensure that every time an invoice is created, it gets a unique invoice_number.
- Typically, the invoice_number is auto-generated, either by using a counter or a UUID, depending on your use case.

Modify the Invoice Creation Logic:

If the invoice_number is supposed to be unique and auto-generated, you can modify your generate_invoice view to generate a unique number when creating the invoice.

Here's an example of how you could ensure unique invoice numbers:

python
import uuid

@login_required
def generate_invoice(request, billing_id):
    """Generates an invoice for the given billing record."""
    billing = get_object_or_404(Billing, id=billing_id)

    # Ensure the invoice number is unique (using UUID or a custom logic)
    invoice_number = str(uuid.uuid4())  # Generates a unique UUID as invoice number

    # Create the invoice record
    invoice = Invoice.objects.create(
        billing=billing,
        invoice_number=invoice_number,
        total_amount=billing.total_cost,  # You can add more details here
    )

    # Proceed with invoice rendering, PDF generation, or any further steps
    return render(request, 'billing/invoice.html', {'invoice': invoice})

If you'd like to implement a sequential invoice numbering system (e.g., INV001, INV002), you could implement logic to retrieve the highest invoice number from the database and increment it.

Ensure Unique Invoice Number on Creation:
- If you're using an auto-incrementing number, you'll want to check that each new invoice_number is unique. If using UUIDs, they should already be unique by design.

Example of Auto-Incrementing Invoice Number: If you want an auto-incrementing invoice number (like INV001, INV002, etc.), here’s an example of how you might implement this:

python
def generate_invoice(request, billing_id):
    """Generates an invoice with a unique, incrementing invoice number."""
    billing = get_object_or_404(Billing, id=billing_id)

    # Get the last invoice and generate the next invoice number
    last_invoice = Invoice.objects.all().order_by('-invoice_number').first()
    if last_invoice:
        last_invoice_number = int(last_invoice.invoice_number[3:])  # Extract number from INVxxx
        new_invoice_number = f"INV{last_invoice_number + 1:03d}"
    else:
        new_invoice_number = "INV001"

    # Create the invoice record
    invoice = Invoice.objects.create(
        billing=billing,
        invoice_number=new_invoice_number,
        total_amount=billing.total_cost,  # Add more fields as needed
    )

    return render(request, 'billing/invoice.html', {'invoice': invoice})

Recap:

Ensure that every invoice_number is unique before inserting the invoice into the database.
If you're using a custom auto-incrementing scheme, ensure the number is correctly incremented.
If using a UUID for uniqueness, this will generally solve the issue by design.

Try updating the logic in your generate_invoice view to create unique invoice_numbers, and the error should be resolved.

Let me know if you need more clarification!

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Invoice - {{ invoice.invoice_number }}</title> <style> body { font-family: Arial, sans-serif; max-width: 800px; margin: 20px auto; padding: 20px; border: 1px solid #ddd; border-radius: 8px; background-color: #f9f9f9; } h1 { color: #333; text-align: center; } .invoice-header { text-align: center; padding: 10px; background: #007bff; color: #fff; border-radius: 8px 8px 0 0; } .invoice-details { padding: 15px; background: #fff; border-radius: 0 0 8px 8px; } .info { margin-bottom: 10px; } table { width: 100%; border-collapse: collapse; margin-top: 15px; } table, th, td { border: 1px solid #ddd; } th, td { padding: 10px; text-align: left; } th { background: #007bff; color: #fff; } .total { font-size: 18px; font-weight: bold; text-align: right; margin-top: 20px; } </style> </head> <body> <div class="invoice-header"> <h1>Invoice: {{ invoice.invoice_number }}</h1> </div> <div class="invoice-details"> <p class="info"><strong>Date:</strong> {{ invoice.date_created }}</p> <p class="info"><strong>Payment Status:</strong> {{ invoice.payment_status }}</p> <h3>Billing Details:</h3> <p><strong>Vehicle:</strong> {{ billing.booking.vehicle.registration_number }} ({{ billing.booking.vehicle.make }} {{ billing.booking.vehicle.model }})</p> <table> <thead> <tr> <th>Service/Part</th> <th>Cost (KSH)</th> <th>Quantity</th> <th>Total (KSH)</th> </tr> </thead> <tbody> <tr> <td>{{ billing.booking.service.name }}</td> <td>{{ billing.booking.service.cost }}</td> <td>1</td> <td>{{ billing.booking.service.cost }}</td> </tr> {% if billing.part %} <tr> <td>{{ billing.part.name }}</td> <td>{{ billing.part.cost }}</td> <td>{{ billing.part_quantity }}</td> <td>{{ billing.part.cost|floatformat:2|add:billing.part_quantity }}</td> </tr> {% endif %} </tbody> </table> <p class="total">Total Amount: KSH {{ invoice.total_amount }}</p> </div> </body> </html> okay but most parts are empty only quantity date state and invoice number are there

It seems that some parts of the template are not rendering the expected data, such as the service details, part details, and total amounts. Let's go through some checks to ensure the correct values are being passed to the template.

Key Points to Check:

Invoice Object:
- Ensure that the invoice object contains all the necessary data for rendering (like date_created, payment_status, etc.).
- Also, ensure that the invoice is properly linked to the Billing and Booking objects, which are necessary for retrieving service, vehicle, part, and other related details.
Booking and Service:
- Ensure that the Billing object is correctly linked to a Booking object, which should contain a service.
- Make sure that the Billing has a part (if one was selected) and that the quantity is being passed correctly.
Quantity Calculation:
- The quantity is currently hardcoded as 1 in the template. If you're storing the quantity of parts in the Billing model, you should use that instead of hardcoding.
Template Logic:
- The floatformat:2 filter is trying to format the cost with two decimal places, but the logic for calculating the total is incorrect in the template. You need to multiply the part cost by the quantity and add it to the service cost.

Suggested Code Adjustments

1. Check Your View:

Ensure that you're passing the correct data from your view to the template. Here's how you can ensure the required details are passed:

python
@login_required
def generate_invoice(request, billing_id):
    """Generates an invoice for the given billing record."""
    billing = get_object_or_404(Billing, id=billing_id)

    # Ensure the service is linked correctly
    booked_service = billing.booking.service
    part = billing.part
    part_quantity = billing.part_quantity if part else 0
    total_amount = billing.total_cost  # This should already be calculated

    # Generate invoice details
    invoice_number = billing.invoice_number  # Example: INV001
    invoice_date = billing.created_at  # Adjust based on your model field
    payment_status = billing.payment_status  # Ensure this exists in your model

    invoice = {
        "invoice_number": invoice_number,
        "date_created": invoice_date,
        "payment_status": payment_status,
        "total_amount": total_amount,
        "booked_service": booked_service,
        "part": part,
        "part_quantity": part_quantity,
        "billing": billing
    }

    return render(request, "billing/invoice.html", invoice)

2. Update Your Template:

With the correct data passed to the template, you can render it like this:

html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice - {{ invoice.invoice_number }}</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 800px;
            margin: 20px auto;
            padding: 20px;
            border: 1px solid #ddd;
            border-radius: 8px;
            background-color: #f9f9f9;
        }
        h1 {
            color: #333;
            text-align: center;
        }
        .invoice-header {
            text-align: center;
            padding: 10px;
            background: #007bff;
            color: #fff;
            border-radius: 8px 8px 0 0;
        }
        .invoice-details {
            padding: 15px;
            background: #fff;
            border-radius: 0 0 8px 8px;
        }
        .info {
            margin-bottom: 10px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 15px;
        }
        table, th, td {
            border: 1px solid #ddd;
        }
        th, td {
            padding: 10px;
            text-align: left;
        }
        th {
            background: #007bff;
            color: #fff;
        }
        .total {
            font-size: 18px;
            font-weight: bold;
            text-align: right;
            margin-top: 20px;
        }
    </style>
</head>
<body>
    <div class="invoice-header">
        <h1>Invoice: {{ invoice.invoice_number }}</h1>
    </div>

    <div class="invoice-details">
        <p class="info"><strong>Date:</strong> {{ invoice.date_created }}</p>
        <p class="info"><strong>Payment Status:</strong> {{ invoice.payment_status }}</p>

        <h3>Billing Details:</h3>
        <p><strong>Vehicle:</strong> {{ invoice.billing.booking.vehicle.registration_number }} ({{ invoice.billing.booking.vehicle.make }} {{ invoice.billing.booking.vehicle.model }})</p>

        <table>
            <thead>
                <tr>
                    <th>Service/Part</th>
                    <th>Cost (KSH)</th>
                    <th>Quantity</th>
                    <th>Total (KSH)</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>{{ invoice.booked_service.name }}</td>
                    <td>{{ invoice.booked_service.cost }}</td>
                    <td>1</td>
                    <td>{{ invoice.booked_service.cost }}</td>
                </tr>
                {% if invoice.part %}
                <tr>
                    <td>{{ invoice.part.name }}</td>
                    <td>{{ invoice.part.cost }}</td>
                    <td>{{ invoice.part_quantity }}</td>
                    <td>{{ invoice.part.cost|floatformat:2|multiply:invoice.part_quantity }}</td>
                </tr>
                {% endif %}
            </tbody>
        </table>

        <p class="total">Total Amount: KSH {{ invoice.total_amount }}</p>
    </div>
</body>
</html>

Key Fixes:

Total Cost Calculation:
- For the part row, you need to multiply invoice.part.cost by invoice.part_quantity. You can use Django's multiply filter or handle this calculation within the view before passing the data to the template.
Data Passing:
- Ensure that the invoice context is fully populated with the relevant fields, such as booked_service, part, part_quantity, etc.
Formatting:
- Ensure that part_quantity is available in the context and that the total calculation for parts is correct.

Debugging Tip:

If you're still encountering empty fields or incorrect values, you can use {{ invoice | json_script }} in your template to output the full contents of the invoice context, and inspect the data being passed to the template.

Let me know if you need more assistance!

AttributeError at /billing/generate_invoice/6/ 'Billing' object has no attribute 'invoice_number' Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/6/ Django Version: 5.1.7 Exception Type: AttributeError Exception Value: 'Billing' object has no attribute 'invoice_number' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 144, in generate_invoice Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Tue, 01 Apr 2025 18:11:56 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\auth\decorators.py, line 60, in _view_wrapper return view_func(request, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 144, in generate_invoice invoice_number = billing.invoice_number # Example: INV001

The error you're encountering ('Billing' object has no attribute 'invoice_number') indicates that the Billing model does not have an invoice_number field, or it hasn't been defined in the database. To resolve this, we need to:

Check the Model Definition: Verify whether the Billing model has an invoice_number field or if it's supposed to be generated dynamically.
Fix the View: If invoice_number is not part of the Billing model, we may need to either generate it dynamically or fetch it from another related model.

Steps to Fix:

1. Check the `Billing` Model:

Inspect the Billing model to ensure that it has an invoice_number field or to understand how the invoice number is supposed to be handled.

python
# In models.py
class Billing(models.Model):
    # Add relevant fields for the billing
    invoice_number = models.CharField(max_length=100, unique=True, blank=True, null=True)  # Example of invoice_number field
    # other fields...

If you don't have an invoice_number field, and it's supposed to be generated dynamically (e.g., a unique string per invoice), you can add a method to generate it.

2. Generate `invoice_number` if it’s Not in the Model:

If invoice_number is not in the model and you're trying to generate it dynamically (e.g., using a combination of a prefix and the object's ID or a sequential number), you can do this in your view or model method.

For example, you can create a generate_invoice_number method in your model:

python
import random
import string

class Billing(models.Model):
    # other fields...
    
    invoice_number = models.CharField(max_length=100, unique=True, blank=True, null=True)

    def generate_invoice_number(self):
        # Generate a random invoice number
        return ''.join(random.choices(string.ascii_uppercase + string.digits, k=8))

    def save(self, *args, **kwargs):
        if not self.invoice_number:
            self.invoice_number = self.generate_invoice_number()  # Generate invoice number if not already set
        super().save(*args, **kwargs)

In the generate_invoice_number method, we're generating a random 8-character string (which can be adjusted according to your needs). You can call this method during the save() to auto-generate the invoice number.

3. Update the View:

If you are generating the invoice number dynamically or fetching it from another model, make sure you access the right attribute. For example:

python
@login_required
def generate_invoice(request, billing_id):
    """Generates an invoice for the given billing record."""
    billing = get_object_or_404(Billing, id=billing_id)

    # If the invoice_number is not set, generate one
    if not billing.invoice_number:
        billing.invoice_number = billing.generate_invoice_number()  # Generate it if not set

    booked_service = billing.booking.service
    part = billing.part
    part_quantity = billing.part_quantity if part else 0
    total_amount = billing.total_cost  # This should already be calculated

    invoice = {
        "invoice_number": billing.invoice_number,  # Now accessible from billing
        "date_created": billing.created_at,  # Adjust based on your model field
        "payment_status": billing.payment_status,  # Ensure this exists in your model
        "total_amount": total_amount,
        "booked_service": booked_service,
        "part": part,
        "part_quantity": part_quantity,
        "billing": billing
    }

    return render(request, "billing/invoice.html", invoice)

4. Migrations:

If you add a new field (invoice_number) to the model, don't forget to create and apply a migration:

bash
python manage.py makemigrations
python manage.py migrate

This will ensure that the invoice_number field is created in the database.

Recap:

Check the Billing model to ensure that invoice_number exists or is being generated.
If it's not in the model, add a method to generate the invoice number dynamically.
Update your view to reference the correct field or method for invoice_number.
Ensure the model migrations are applied if any changes were made to the model.

Let me know if you need further assistance!

from django.db import models from accounts.models import CustomUser class Customer(models.Model): user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True) name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) def __str__(self): return self.name class Vehicle(models.Model): customer = models.ForeignKey(Customer, on_delete=models.CASCADE) make = models.CharField(max_length=50) model = models.CharField(max_length=50) registration_number = models.CharField(max_length=20, unique=True) def __str__(self): return f"{self.make} {self.model} - {self.registration_number}" class Service(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) def __str__(self): return f"{self.name} - KSH {self.cost}" class Part(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) def __str__(self): return f"{self.name} - KSH {self.cost}" class Booking(models.Model): user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings",null=True,blank=True) vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings") service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings" ) created_at = models.DateTimeField(auto_now_add=True) # Timestamp of booking def __str__(self): return f"{self.vehicle.registration_number} - {self.service.name}" class Billing(models.Model): booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True, related_name="bookings") part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True, related_name="bookings") part_quantity = models.IntegerField(default=1) total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True) # Ensuring no NULL values payment_method = models.CharField(max_length=50) payment_amount = models.DecimalField(max_digits=10, decimal_places=2) def calculate_total(self): total = self.booking.service.cost if self.booking else 0 # Prevents crashes if booking is NULL if self.part: total += self.part.cost * self.part_quantity return total def save(self, *args, **kwargs): self.total_cost = self.calculate_total() # Ensure total cost is always set super().save(*args, **kwargs) def __str__(self): return f"Billing for {self.booking} - Total: KSH {self.total_cost}" class Invoice(models.Model): billing = models.OneToOneField(Billing, on_delete=models.CASCADE) invoice_number = models.CharField(max_length=50, unique=True, blank=True) date_created = models.DateTimeField(auto_now_add=True) total_amount = models.DecimalField(max_digits=10, decimal_places=2) payment_status = models.CharField(max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid') def __str__(self): return f"Invoice #{self.invoice_number} - {self.payment_status}" def generate_invoice_number(self): # Example logic for generating an invoice number return f"INV-{self.id}" def save(self, *args, **kwargs): if not self.invoice_number: super().save(*args, **kwargs) # Save first to get a PK self.invoice_number = self.generate_invoice_number() self.total_amount = self.billing.total_cost # Ensure total amount is copied super().save(*args, **kwargs) # Save again with invoice number here is the models <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Invoice - {{ invoice.invoice_number }}</title> <style> body { font-family: Arial, sans-serif; max-width: 800px; margin: 20px auto; padding: 20px; border: 1px solid #ddd; border-radius: 8px; background-color: #f9f9f9; } h1 { color: #333; text-align: center; } .invoice-header { text-align: center; padding: 10px; background: #007bff; color: #fff; border-radius: 8px 8px 0 0; } .invoice-details { padding: 15px; background: #fff; border-radius: 0 0 8px 8px; } .info { margin-bottom: 10px; } table { width: 100%; border-collapse: collapse; margin-top: 15px; } table, th, td { border: 1px solid #ddd; } th, td { padding: 10px; text-align: left; } th { background: #007bff; color: #fff; } .total { font-size: 18px; font-weight: bold; text-align: right; margin-top: 20px; } </style> </head> <body> <div class="invoice-header"> <h1>Invoice: {{ invoice.invoice_number }}</h1> </div> <div class="invoice-details"> <p class="info"><strong>Date:</strong> {{ invoice.date_created }}</p> <p class="info"><strong>Payment Status:</strong> {{ invoice.payment_status }}</p> <h3>Billing Details:</h3> <p><strong>Vehicle:</strong> {{ billing.booking.vehicle.registration_number }} ({{ billing.booking.vehicle.make }} {{ billing.booking.vehicle.model }})</p> <table> <thead> <tr> <th>Service/Part</th> <th>Cost (KSH)</th> <th>Quantity</th> <th>Total (KSH)</th> </tr> </thead> <tbody> <tr> <td>{{ billing.booking.service.name }}</td> <td>{{ billing.booking.service.cost }}</td> <td>1</td> <td>{{ billing.booking.service.cost }}</td> </tr> {% if billing.part %} <tr> <td>{{ billing.part.name }}</td> <td>{{ billing.part.cost }}</td> <td>{{ billing.part_quantity }}</td> <td>{{ billing.part.cost|floatformat:2|add:billing.part_quantity }}</td> </tr> {% endif %} </tbody> </table> <p class="total">Total Amount: KSH {{ invoice.total_amount }}</p> </div> </body> </html> invoice.html why is the quantity only visible and time, status vehicle shows vehicle:()

The issue where only the quantity, time, and status are visible, and the vehicle shows as empty (vehicle:()), is likely due to how you're referencing the related fields in your invoice.html template.

Issue Breakdown:

Vehicle information not displaying:
- {{ billing.booking.vehicle.registration_number }} ({{ billing.booking.vehicle.make }} {{ billing.booking.vehicle.model }}) shows empty.
- This suggests that either:
  - The billing.booking object is not properly linked to a Booking instance.
  - The Booking instance doesn't have an associated Vehicle object.
Other fields (such as quantity, time, and status) showing correctly:
- These are fields directly on the Invoice or related models and are likely being accessed correctly.

Possible Solutions:

Ensure billing.booking is correctly linked:
- When you're accessing the vehicle information through billing.booking, ensure that booking in Billing is properly related to a Booking instance and that the Booking instance has a valid Vehicle.
Check that Billing objects are correctly related to Booking objects, and that those Booking objects have a related Vehicle object.

For instance, if you want to access the Vehicle object through booking, it should work like this:
```
python
billing.booking.vehicle.registration_number
```
If the booking is empty or not linked properly, it will result in an error or blank output.
Check for None values or missing relationships:
- If a Booking does not have a valid Vehicle linked, it will return None. Ensure that each Booking has an associated Vehicle. You can add checks in your template:
```
html
<p><strong>Vehicle:</strong> {% if billing.booking.vehicle %}{{ billing.booking.vehicle.registration_number }} ({{ billing.booking.vehicle.make }} {{ billing.booking.vehicle.model }}){% else %}Not Available{% endif %}</p>
```
This check ensures that if the Vehicle is not available, it doesn't throw an error, and instead, it shows "Not Available".

Check the view logic:

Ensure you're passing the correct billing object to the template. Double-check that you're correctly fetching the Billing object and passing the invoice context to the template. In your view, make sure you pass both the invoice and billing objects:

python
@login_required
def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)
    invoice = billing.invoice_set.first()  # Assuming one-to-one relationship with Invoice

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Ensure that the billing object has the correct Booking and Vehicle linked.

Updated Template:

Here's how you can update your template to ensure that everything is properly displayed:

html
<div class="invoice-details">
    <p class="info"><strong>Date:</strong> {{ invoice.date_created }}</p>
    <p class="info"><strong>Payment Status:</strong> {{ invoice.payment_status }}</p>

    <h3>Billing Details:</h3>
    <p><strong>Vehicle:</strong> {% if billing.booking.vehicle %}{{ billing.booking.vehicle.registration_number }} ({{ billing.booking.vehicle.make }} {{ billing.booking.vehicle.model }}){% else %}Not Available{% endif %}</p>

    <table>
        <thead>
            <tr>
                <th>Service/Part</th>
                <th>Cost (KSH)</th>
                <th>Quantity</th>
                <th>Total (KSH)</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>{{ billing.booking.service.name }}</td>
                <td>{{ billing.booking.service.cost }}</td>
                <td>{{ billing.part_quantity }}</td>
                <td>{{ billing.booking.service.cost|add:billing.part_quantity }}</td>  <!-- You can adjust this calculation -->
            </tr>
            {% if billing.part %}
            <tr>
                <td>{{ billing.part.name }}</td>
                <td>{{ billing.part.cost }}</td>
                <td>{{ billing.part_quantity }}</td>
                <td>{{ billing.part.cost|floatformat:2|add:billing.part_quantity }}</td>
            </tr>
            {% endif %}
        </tbody>
    </table>

    <p class="total">Total Amount: KSH {{ invoice.total_amount }}</p>
</div>

Key Changes:

Added the if condition to check if billing.booking.vehicle exists, to avoid errors if no Vehicle is associated.
The quantity calculation is updated, and I suggest reviewing the logic behind your Total (KSH) to make sure it reflects the correct sum of service cost and part cost * quantity.

Let me know how this goes or if you'd like further assistance!

VariableDoesNotExist at /billing/generate_invoice/9/ Failed lookup for key [billing] in [{'True': True, 'False': False, 'None': None}, {}, {}, {'invoice': <Invoice: Invoice #c57152b6-5c09-4696-816e-1aefc3dfd606 - Unpaid>}] Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/9/ Django Version: 5.1.7 Exception Type: VariableDoesNotExist Exception Value: Failed lookup for key [billing] in [{'True': True, 'False': False, 'None': None}, {}, {}, {'invoice': <Invoice: Invoice #c57152b6-5c09-4696-816e-1aefc3dfd606 - Unpaid>}] Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py, line 906, in _resolve_lookup Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Tue, 01 Apr 2025 18:20:12 +0000

The error message you're seeing (VariableDoesNotExist: Failed lookup for key [billing]) means that the billing context variable isn't being passed to the template. You’re trying to access billing in your template, but it's not available in the context.

To fix this, follow these steps:

Check the View Logic:

You are likely passing only invoice to the template but are trying to access billing as well.
In your view, you need to pass both invoice and billing objects to the template.

Example view logic:

python
from django.shortcuts import render, get_object_or_404
from .models import Billing, Invoice

def generate_invoice(request, billing_id):
    # Get the Billing instance (using billing_id)
    billing = get_object_or_404(Billing, id=billing_id)
    # Get the associated Invoice (one-to-one relationship)
    invoice = billing.invoice_set.first()  # Assuming a one-to-one relationship
    
    # Pass both 'invoice' and 'billing' to the template
    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Update Your Template:

Make sure that you're correctly accessing the billing variable in your template.

html
<div class="invoice-details">
    <p class="info"><strong>Date:</strong> {{ invoice.date_created }}</p>
    <p class="info"><strong>Payment Status:</strong> {{ invoice.payment_status }}</p>

    <h3>Billing Details:</h3>
    <p><strong>Vehicle:</strong> {% if billing.booking.vehicle %}{{ billing.booking.vehicle.registration_number }} ({{ billing.booking.vehicle.make }} {{ billing.booking.vehicle.model }}){% else %}Not Available{% endif %}</p>

    <table>
        <thead>
            <tr>
                <th>Service/Part</th>
                <th>Cost (KSH)</th>
                <th>Quantity</th>
                <th>Total (KSH)</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>{{ billing.booking.service.name }}</td>
                <td>{{ billing.booking.service.cost }}</td>
                <td>{{ billing.part_quantity }}</td>
                <td>{{ billing.booking.service.cost|add:billing.part_quantity }}</td>  <!-- You can adjust this calculation -->
            </tr>
            {% if billing.part %}
            <tr>
                <td>{{ billing.part.name }}</td>
                <td>{{ billing.part.cost }}</td>
                <td>{{ billing.part_quantity }}</td>
                <td>{{ billing.part.cost|floatformat:2|add:billing.part_quantity }}</td>
            </tr>
            {% endif %}
        </tbody>
    </table>

    <p class="total">Total Amount: KSH {{ invoice.total_amount }}</p>
</div>

Confirm Model Relationships: Ensure the relationships between Billing, Booking, Invoice, and Vehicle are set up properly. Here's a reminder of how they should be related:
- Billing should have a booking that is linked to Booking.
- Booking should have a vehicle related to Vehicle.
- Billing can have part and part_quantity attributes.

By making these changes, you should be able to resolve the issue and correctly pass both invoice and billing to your template. Let me know if that works for you!

AttributeError at /billing/generate_invoice/9/ 'Billing' object has no attribute 'invoice_set' Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/9/ Django Version: 5.1.7 Exception Type: AttributeError Exception Value: 'Billing' object has no attribute 'invoice_set' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 136, in generate_invoice Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Tue, 01 Apr 2025 18:22:08 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 136, in generate_invoice invoice = billing.invoice_set.first() # Assuming a one-to-one relationship ^^^^^^^^^^^^^^^^^^^ … Local vars

The error message you're encountering ('Billing' object has no attribute 'invoice_set') is because Billing does not have a reverse relationship to Invoice. The reverse relationship invoice_set would only exist if you defined a ForeignKey from Invoice to Billing and specified the reverse relation name.

However, since you already have a OneToOneField from Invoice to Billing, you can access the associated Invoice from the Billing object directly without using invoice_set.

Solution:

In your view, replace this line:

python
invoice = billing.invoice_set.first()  # Assuming a one-to-one relationship

with this:

python
invoice = billing.invoice  # Access the related Invoice directly

Since Invoice has a OneToOneField to Billing, you can access the Invoice object directly through the invoice attribute of Billing.

Final View Code Example:

python
from django.shortcuts import render, get_object_or_404
from .models import Billing, Invoice

def generate_invoice(request, billing_id):
    # Get the Billing instance using billing_id
    billing = get_object_or_404(Billing, id=billing_id)
    
    # Access the associated Invoice directly
    invoice = billing.invoice  # Access related Invoice using the 'invoice' attribute

    # Pass both 'invoice' and 'billing' to the template
    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

This should fix the error, as you're now correctly accessing the related Invoice object from Billing using the direct reference rather than the reverse manager invoice_set. Let me know if this resolves the issue!

todays focus is accounts>customer_dashboard .html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Customer Dashboard</title>  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css"> <style> .card { border-radius: 10px; box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); } .card-header { background-color: #343a40; color: #fff; border-radius: 10px 10px 0 0; font-weight: bold; } .card-body { padding: 20px; } .list-group-item { border: none; border-bottom: 1px solid #f1f1f1; padding: 10px; font-size: 16px; } .list-group-item:last-child { border-bottom: none; } .navbar { border-radius: 0 0 15px 15px; } footer { background-color: #343a40; } .hero-section { background-color: #007bff; color: white; padding: 50px 0; text-align: center; } .hero-section h2 { font-size: 36px; } .hero-section p { font-size: 18px; } .navbar-nav .nav-item { margin-left: 20px; } .container { max-width: 1200px; } </style> </head> <body>  <nav class="navbar navbar-expand-lg navbar-dark bg-dark"> <div class="container"> <a class="navbar-brand" href="{% url 'home' %}">Garage System</a> <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="navbarNav"> <ul class="navbar-nav ms-auto"> <li class="nav-item"><a class="nav-link" href="{% url 'home' %}">Home</a></li> <li class="nav-item"><a class="nav-link" href="{% url 'services:services' %}">Services</a></li> <li class="nav-item"><a class="nav-link" href="{% url 'billing' %}">Billing</a></li> <li class="nav-item"><a class="nav-link" href="{% url 'insurance' %}">Insurance</a></li> {% if user.is_authenticated %} <li class="nav-item"><a class="nav-link" href="{% url 'accounts:logout' %}">Logout</a></li> {% else %} <li class="nav-item"><a class="nav-link" href="{% url 'accounts:login' %}">Login</a></li> {% endif %} </ul> </div> </div> </nav>  <div class="hero-section"> <h2>Welcome, {{ user.username }}!</h2> <p>Manage your services, billing, and insurance in one place.</p> </div>  <div class="container mt-4"> <div class="row"> <div class="col-md-4"> <div class="card"> <div class="card-header"> <h5>Your Services</h5> </div> <div class="card-body"> <ul class="list-group"> <li class="list-group-item"><a href="{% url 'services:services' %}">View Available Services</a></li> <li class="list-group-item"><a href="#">Request a Service</a></li> <li class="list-group-item"><a href="#">Track Service Progress</a></li> </ul> </div> </div> </div> <div class="col-md-4"> <div class="card"> <div class="card-header"> <h5>Your Billing</h5> </div> <div class="card-body"> <ul class="list-group"> <li class="list-group-item"><a href="{% url 'billing' %}">View Billing History</a></li> <li class="list-group-item"><a href="#">Make a Payment</a></li> <li class="list-group-item"><a href="#">View Outstanding Balance</a></li> </ul> </div> </div> </div> <div class="col-md-4"> <div class="card"> <div class="card-header"> <h5>Your Insurance</h5> </div> <div class="card-body"> <ul class="list-group"> <li class="list-group-item"><a href="{% url 'insurance' %}">View Insurance Policy</a></li> <li class="list-group-item"><a href="#">Request Insurance</a></li> <li class="list-group-item"><a href="#">Insurance Claims</a></li> </ul> </div> </div> </div> </div> </div>  <footer class="bg-dark text-white text-center py-3 mt-4"> <p>© 2025 Garage System. All rights reserved.</p> </footer>  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script> </body> </html> lets work on <li class="list-group-item"><a href="#">Request a Service</a></li>\

To implement "Request a Service", we'll do the following:

Create a URL and View for Service Requests
Build a Form for Customers to Select a Service and Vehicle
Save the Request in the Database
Redirect the User to a Confirmation Page

Step 1: Define URL for Service Requests

In services/urls.py, add a new route:

python
from django.urls import path
from .views import request_service

app_name = "services"

urlpatterns = [
    path("request/", request_service, name="request_service"),
]

Step 2: Create the View for Requesting a Service

In services/views.py, add:

python
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .models import Service
from billing.models import Booking, Vehicle  # Assuming Vehicle is in billing.models
from .forms import ServiceRequestForm

@login_required
def request_service(request):
    user = request.user

    # Get the customer's vehicles
    vehicles = Vehicle.objects.filter(customer__user=user)
    services = Service.objects.all()

    if request.method == "POST":
        form = ServiceRequestForm(request.POST)
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]
            booking = Booking.objects.create(user=user, vehicle=vehicle, service=service)
            return redirect("services:request_success")  # Redirect to success page

    else:
        form = ServiceRequestForm()

    return render(request, "services/request_service.html", {"form": form, "vehicles": vehicles, "services": services})

Step 3: Create a Form for Service Requests

In services/forms.py, add:

python
from django import forms
from .models import Service
from billing.models import Vehicle  # Assuming Vehicle is in billing.models

class ServiceRequestForm(forms.Form):
    service = forms.ModelChoiceField(queryset=Service.objects.all(), label="Select Service")
    vehicle = forms.ModelChoiceField(queryset=Vehicle.objects.none(), label="Select Vehicle")

    def __init__(self, *args, **kwargs):
        user = kwargs.pop("user", None)
        super().__init__(*args, **kwargs)
        if user:
            self.fields["vehicle"].queryset = Vehicle.objects.filter(customer__user=user)

Step 4: Create the Request Service Page

Create templates/services/request_service.html:

html
{% extends "base.html" %}
{% block content %}
<div class="container mt-4">
    <h2>Request a Service</h2>
    <form method="post">
        {% csrf_token %}
        <div class="mb-3">
            <label class="form-label">{{ form.service.label }}</label>
            {{ form.service }}
        </div>
        <div class="mb-3">
            <label class="form-label">{{ form.vehicle.label }}</label>
            {{ form.vehicle }}
        </div>
        <button type="submit" class="btn btn-primary">Submit Request</button>
    </form>
</div>
{% endblock %}

Step 5: Create a Confirmation Page

Create services/request_success.html:

html
{% extends "base.html" %}
{% block content %}
<div class="container mt-4 text-center">
    <h2>Service Request Submitted</h2>
    <p>Your service request has been successfully submitted. We will process it shortly.</p>
    <a href="{% url 'services:services' %}" class="btn btn-primary">Back to Services</a>
</div>
{% endblock %}

Step 6: Add Success URL in `services/urls.py`

python
path("request-success/", TemplateView.as_view(template_name="services/request_success.html"), name="request_success"),

Step 7: Update `customer_dashboard.html`

Modify:

html
<li class="list-group-item"><a href="{% url 'services:request_service' %}">Request a Service</a></li>

Now, when a user clicks "Request a Service", they will:
✅ Select a service and vehicle
✅ Submit the request
✅ See a confirmation page

Let me know if you need any changes! 🚀

ValueError at /services/request/ The view services.views.request_service didn't return an HttpResponse object. It returned None instead. Request Method: GET Request URL: http://127.0.0.1:8000/services/request/ Django Version: 5.1.7 Exception Type: ValueError Exception Value: The view services.views.request_service didn't return an HttpResponse object. It returned None instead. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 332, in check_response Raised during: services.views.request_service Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Wed, 02 Apr 2025 07:14:31 +0000

This error means your request_service view is not returning an HTTP response. Most likely, it is missing a return statement.

Fix Your `request_service` View

Check your services/views.py file and ensure your view is returning an HttpResponse or rendering a template.

Example Fix:

python
from django.shortcuts import render

def request_service(request):
    return render(request, 'services/request_service.html')

Next Steps

Ensure the template exists:
Create services/templates/services/request_service.html and add a simple form for requesting a service.
Restart the server:
If the error persists, restart the Django development server:
```
sh
python manage.py runserver
```

Let me know if you need further help! 🚀

@login_required def request_service(request): user = request.user # Get the customer's vehicles vehicles = Vehicle.objects.filter(customer__user=user) services = Service.objects.all() if request.method == "POST": form = ServiceRequestForm(request.POST) if form.is_valid(): service = form.cleaned_data["service"] vehicle = form.cleaned_data["vehicle"] booking = Booking.objects.create(user=user, vehicle=vehicle, service=service) return redirect("services:request_success") # Redirect to success page correct?

You're almost there! The issue is that your view does not return an HTTP response for GET requests or if the form is invalid.

Fix

Make sure to handle both GET requests and cases where the form is invalid. You need to:

Initialize form = ServiceRequestForm() for GET requests.
Ensure return render(...) is always executed.

Corrected Code

python
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .models import Vehicle, Service, Booking
from .forms import ServiceRequestForm

@login_required
def request_service(request):
    user = request.user

    # Get the customer's vehicles
    vehicles = Vehicle.objects.filter(customer__user=user)
    services = Service.objects.all()

    if request.method == "POST":
        form = ServiceRequestForm(request.POST)
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]
            Booking.objects.create(user=user, vehicle=vehicle, service=service)
            return redirect("services:request_success")  # Redirect to success page
    else:
        form = ServiceRequestForm()

    return render(request, "services/request_service.html", {"form": form, "vehicles": vehicles, "services": services})

Why This Works

✅ Ensures return render(...) is always executed
✅ Handles both GET and POST requests properly
✅ Passes the required context (vehicles and services)

Final Step:

Make sure services/request_service.html exists and contains a form using {{ form }}.
Restart your Django server if necessary. 🚀

{% extends "base.html" %} {% block content %} <div class="container mt-4"> <h2>Request a Service</h2> <form method="post"> {% csrf_token %} <div class="mb-3"> <label class="form-label">{{ form.service.label }}</label> {{ form.service }} </div> <div class="mb-3"> <label class="form-label">{{ form.vehicle.label }}</label> {{ form.vehicle }} </div> <button type="submit" class="btn btn-primary">Submit Request</button> </form> </div> {% endblock %} empty

If your form fields are not appearing on the page, try these debugging steps:

1️⃣ Check if the Form is Being Passed to the Template

Modify your view to print form before rendering:

python
print(form)  # Add this line before return render()

If form is None, the issue is with how you're initializing it.

2️⃣ Ensure the Form is Correctly Defined

In forms.py, your ServiceRequestForm should look something like this:

python
from django import forms
from .models import Booking

class ServiceRequestForm(forms.ModelForm):
    class Meta:
        model = Booking
        fields = ["service", "vehicle"]  # Make sure these fields exist in the model

3️⃣ Confirm `services/request_service.html` is Receiving the Form

Modify the template to display the form as raw HTML for debugging:

html
<pre>{{ form.as_p }}</pre>

If this still doesn’t show anything, the form might not be passed correctly in request_service().

4️⃣ Ensure You Are Passing `form` in the View

Your view should always pass form to the template:

python
return render(request, "services/request_service.html", {"form": form})

5️⃣ Check If Services and Vehicles Exist in the Database

Run these queries in Django shell:

python
from services.models import Service, Vehicle
print(Service.objects.all())  
print(Vehicle.objects.all())

If these return empty results ([]), you need to add data via the admin panel or fixtures.

Try these steps and let me know what happens! 🚀

from django import forms from core.models import Service from billing.models import Vehicle # Assuming Vehicle is in billing.models class ServiceRequestForm(forms.Form): service = forms.ModelChoiceField(queryset=Service.objects.all(), label="Select Service") vehicle = forms.ModelChoiceField(queryset=Vehicle.objects.none(), label="Select Vehicle") def __init__(self, *args, **kwargs): user = kwargs.pop("user", None) super().__init__(*args, **kwargs) if user: self.fields["vehicle"].queryset = Vehicle.objects.filter(customer__user=user)

Your form logic looks good, but here are a few things to check if it's not displaying in your template:

✅ Fix: Ensure the Form is Initialized with `user` in the View

Modify your request_service view to pass user to the form:

python
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .forms import ServiceRequestForm
from core.models import Service
from billing.models import Vehicle
from services.models import Booking  # Ensure Booking is properly imported

@login_required
def request_service(request):
    user = request.user  # Get the logged-in user

    if request.method == "POST":
        form = ServiceRequestForm(request.POST, user=user)  # Pass user to form
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]
            Booking.objects.create(user=user, vehicle=vehicle, service=service)
            return redirect("services:request_success")  # Redirect after successful booking
    else:
        form = ServiceRequestForm(user=user)  # Ensure form is initialized correctly

    return render(request, "services/request_service.html", {"form": form})

🔍 Debugging Steps

If the form is still not appearing, check:

1️⃣ Are Vehicles Associated with the User?
Run this in Django shell (python manage.py shell):

python
from billing.models import Vehicle
from django.contrib.auth.models import User

user = User.objects.get(username="your_username")  # Replace with your username
vehicles = Vehicle.objects.filter(customer__user=user)
print(vehicles)  # Should return a list of vehicles

✅ If empty ([]), the user doesn’t own any vehicles, so the form doesn’t show options.

2️⃣ Is the Form Passed to the Template?
Modify the template to check if the form is received:

html
{{ form.as_p }}

✅ If nothing appears, the form isn't being passed correctly in request_service().

Try these fixes and let me know what happens! 🚀

{% extends 'core/base.html' %} {% load static %} {% block content %} <div class="container py-5"> <h1 class="text-center mb-4">Our Services</h1> <div class="row"> {% for service in services %} <div class="col-md-4 mb-4"> <div class="card"> <img src="{% static 'images/repair.png' %}" class="card-img-top" alt="{{ service.name }}"> <div class="card-body"> <h5 class="card-title">{{ service.name }}</h5> <p class="card-text">{{ service.description }}</p> <h6 class="text-primary">{{ service.price }}</h6> </div> </div> </div> {% endfor %} </div> </div> {% endblock %} here is service_list.html and its working

Great! Since service_list.html is working, we know that your Service model and database queries are fine. Now, let's focus on getting the "Request a Service" page to work properly.

🛠 Fix for Empty Form Issue

If your "Request a Service" page is empty or the form is not displaying, here are some things to check:

✅ 1. Ensure the Form is Being Passed in the View

Update your request_service view to correctly pass the form:

python
from django.shortcuts import render, redirect
from django.contrib.auth.decorators import login_required
from .forms import ServiceRequestForm
from services.models import Booking
from core.models import Service
from billing.models import Vehicle

@login_required
def request_service(request):
    user = request.user  # Get the logged-in user

    if request.method == "POST":
        form = ServiceRequestForm(request.POST, user=user)  # Pass user to form
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]
            Booking.objects.create(user=user, vehicle=vehicle, service=service)
            return redirect("services:request_success")  # Redirect after successful booking
    else:
        form = ServiceRequestForm(user=user)  # Ensure form is initialized correctly

    return render(request, "services/request_service.html", {"form": form})

Key Fixes:

✅ Pass user to ServiceRequestForm so it fetches the correct vehicles.
✅ Ensure form is initialized in the GET request.

✅ 2. Update `ServiceRequestForm`

Your form is almost correct, but make sure it properly filters vehicles belonging to the logged-in user:

python
from django import forms
from core.models import Service
from billing.models import Vehicle

class ServiceRequestForm(forms.Form):
    service = forms.ModelChoiceField(queryset=Service.objects.all(), label="Select Service")
    vehicle = forms.ModelChoiceField(queryset=Vehicle.objects.none(), label="Select Vehicle")

    def __init__(self, *args, **kwargs):
        user = kwargs.pop("user", None)
        super().__init__(*args, **kwargs)
        if user:
            self.fields["vehicle"].queryset = Vehicle.objects.filter(customer__user=user)

✅ Fix: Ensure the form filters only vehicles owned by the logged-in user.

✅ 3. Check the Template

Make sure the request_service.html template is correctly displaying the form:

html
{% extends "base.html" %}
{% block content %}
<div class="container mt-4">
    <h2>Request a Service</h2>
    <form method="post">
        {% csrf_token %}
        <div class="mb-3">
            <label class="form-label">{{ form.service.label }}</label>
            {{ form.service }}
        </div>
        <div class="mb-3">
            <label class="form-label">{{ form.vehicle.label }}</label>
            {{ form.vehicle }}
        </div>
        <button type="submit" class="btn btn-primary">Submit Request</button>
    </form>
</div>
{% endblock %}

✅ Fix: Add {{ form.as_p }} inside the form to check if it renders correctly.
If it doesn't, that means the form isn't passed correctly from the view.

🔍 Still Not Working? Debug It!

If your form is still empty, do these debugging steps:

1️⃣ Check if Vehicles Exist for the User
Run in Django shell (python manage.py shell):

python
from billing.models import Vehicle
from django.contrib.auth.models import User

user = User.objects.get(username="your_username")  # Replace with your username
vehicles = Vehicle.objects.filter(customer__user=user)
print(vehicles)  # Should return a list of vehicles

If empty ([]), the user doesn’t own any vehicles, so the form doesn’t display them.

2️⃣ Check if Form is Passed to Template Modify request_service.html temporarily:

html
{{ form.as_p }}

If nothing appears, the form isn’t being passed correctly in the view.

🎯 Final Check

Now, update the link in customer_dashboard.html to point to the request service page:

html
<li class="list-group-item"><a href="{% url 'services:request_service' %}">Request a Service</a></li>

✅ Make sure the URL name in urls.py matches services:request_service.

🚀 Conclusion

If you follow these steps, your "Request a Service" page should work correctly. Let me know if you run into any issues! 🚀

PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from billing.models import Vehicle >>> from django.contrib.auth.models import User >>> >>> user = User.objects.get(username="your_username") # Replace with your username Traceback (most recent call last): File "<console>", line 1, in <module> File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 196, in __get__ raise AttributeError( AttributeError: Manager isn't available; 'auth.User' has been swapped for 'accounts.CustomUser' >>> vehicles = Vehicle.objects.filter(customer__user=user) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'user' is not defined. Did you mean: 'User'? >>> print(vehicles) # Should return a list of vehicles Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'vehicles' is not defined. Did you mean: 'Vehicle'? >>>

You're using a custom user model (accounts.CustomUser) instead of Django’s default User. That's why User.objects.get(username="your_username") isn't working. You need to query your CustomUser model instead.

✅ Fix: Use Your Custom User Model

Modify your shell command to use the correct model:

python
from billing.models import Vehicle
from accounts.models import CustomUser  # Use your custom user model

user = CustomUser.objects.get(username="your_actual_username")  # Replace with the real username
vehicles = Vehicle.objects.filter(customer__user=user)
print(vehicles)  # Should return a QuerySet of vehicles

🔍 What If It Still Doesn't Work?

If vehicles is empty ([]), try checking:

1️⃣ Does the user exist?

python
users = CustomUser.objects.all()
print(users)  # See if your users exist

2️⃣ Does the Vehicle model relate correctly to the user?
Check the Vehicle model in billing/models.py:

python
class Vehicle(models.Model):
    customer = models.ForeignKey("accounts.Customer", on_delete=models.CASCADE)  # Check this field
    ...

Make sure customer is related to CustomUser.

3️⃣ Check the database directly
If you're using SQLite, open db.sqlite3 and run:

sql
SELECT * FROM billing_vehicle;

If vehicles exist but aren’t linked to users, you may need to update your data manually.

🚀 Next Steps

If vehicles is empty, make sure your test user owns a vehicle.
If the query throws an error, check your models and relationships.

Let me know what happens after this! 🚀

File "<console>", line 1, in <module> IndentationError: unexpected indent >>> NameError: name 'user' is not defined. Did you mean: 'User'? File "<console>", line 1 NameError: name 'user' is not defined. Did you mean: 'User'? ^^^^^^ SyntaxError: invalid syntax >>> >>> print(vehicles) # Should return a QuerySet of vehicles File "<console>", line 1 >>> print(vehicles) # Should return a QuerySet of vehicles ^^ SyntaxError: invalid syntax >>> Traceback (most recent call last): File "<console>", line 1 Traceback (most recent call last): ^^^^^^^^^^^ SyntaxError: invalid syntax. Perhaps you forgot a comma? >>> File "<console>", line 1, in <module> File "<console>", line 1 File "<console>", line 1, in <module> IndentationError: unexpected indent >>> NameError: name 'vehicles' is not defined. Did you mean: 'Vehicle'? File "<console>", line 1 NameError: name 'vehicles' is not defined. Did you mean: 'Vehicle'? ^^^^^^^^^^ SyntaxError: invalid syntax >>> >>>

It looks like you accidentally copied error messages into the Python shell, which caused syntax errors. Let's go step by step to correctly debug your issue.

✅ Step 1: Start Django Shell

Make sure you're running the shell properly:

sh
python manage.py shell

✅ Step 2: Import Necessary Models

Once inside the shell, import your models correctly:

python
from billing.models import Vehicle
from accounts.models import CustomUser  # Use your actual custom user model

✅ Step 3: Get the User

Try to fetch the user using their actual username:

python
user = CustomUser.objects.get(username="your_actual_username")  # Replace with real username

🚨 If you get an error (e.g., DoesNotExist), check existing users:

python
users = CustomUser.objects.all()
print(users)  # See available users

Pick a valid username from the list.

✅ Step 4: Check for Vehicles

Now, check if the user owns any vehicles:

python
vehicles = Vehicle.objects.filter(customer__user=user)
print(vehicles)  # Should return a QuerySet of vehicles

🔍 Possible Issues & Fixes

1️⃣ If user isn't found → Make sure the username exists (print(users)).
2️⃣ If vehicles is empty ([]) → Check if vehicles exist for that user.
3️⃣ If you get an error like "customer__user" field doesn't exist → Check if your Vehicle model is correctly related to CustomUser.

💡 Next Steps

Try these steps and let me know the exact error if anything still doesn’t work. 🚀

Great! You have four users: admin, lau, mayor, and sylvia. Now, let's proceed.

✅ Step 5: Select the Correct User

Since your previous command failed because the user wasn’t found, try fetching an existing user:

python
user = CustomUser.objects.get(username="lau")  # Replace with your desired username
print(user)  # Should print user details

🚨 If this fails, check the exact error message.

✅ Step 6: Check for Vehicles

Now, run:

python
vehicles = Vehicle.objects.filter(customer__user=user)
print(vehicles)  # Should return a QuerySet of vehicles

If vehicles is empty ([]), then this user does not have any vehicles assigned.

🔍 If You Get an Error Like `FieldError`

1️⃣ Check if Vehicle has a proper relationship to CustomUser in billing.models:

python
class Vehicle(models.Model):
    customer = models.ForeignKey(CustomUser, on_delete=models.CASCADE)  # Should relate to CustomUser

2️⃣ If customer__user doesn't exist, try just customer:

python
vehicles = Vehicle.objects.filter(customer=user)
print(vehicles)

🚀 Try These & Share Any Errors

Let me know what print(vehicles) outputs!

It seems that the user object was successfully fetched as "lau". Now, let's proceed to check the vehicles for this user.

✅ Step 7: Check for Vehicles

Run the following command to fetch the vehicles associated with this user:

python
vehicles = Vehicle.objects.filter(customer=user)
print(vehicles)  # This should print the list of vehicles associated with the user "lau"

If vehicles returns an empty list ([]), then the user does not have any vehicles associated yet. If that's the case, we can discuss how to add a vehicle to the system.

Let me know the output after running this command!

>>> user = CustomUser.objects.get(username="lau") # Replace with your desired username >>> print(user) # Should print user details lau >>> >>> vehicles = Vehicle.objects.filter(customer=user) Traceback (most recent call last): File "<console>", line 1, in <module> File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1476, in filter return self._filter_or_exclude(False, args, kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1494, in _filter_or_exclude clone._filter_or_exclude_inplace(negate, args, kwargs) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1501, in _filter_or_exclude_inplace self._query.add_q(Q(*args, **kwargs)) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\query.py", line 1609, in add_q clause, _ = self._add_q(q_object, self.used_aliases) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\query.py", line 1641, in _add_q child_clause, needed_inner = self.build_filter( ^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\query.py", line 1528, in build_filter self.check_related_objects(join_info.final_field, value, join_info.opts) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\query.py", line 1342, in check_related_objects self.check_query_object_type(value, opts, field) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\query.py", line 1319, in check_query_object_type raise ValueError( ValueError: Cannot query "lau": Must be "Customer" instance. >>> print(vehicles) # This should print the list of vehicles associated with the user "lau" Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'vehicles' is not defined. Did you mean: 'Vehicle'? >>>

It seems there's an issue with the query. The error Cannot query "lau": Must be "Customer" instance indicates that you are trying to filter the Vehicle model based on the User directly, but the relationship is most likely defined through a Customer model, not User directly.

Here's how to resolve it:

Identify the correct model for querying: You need to filter vehicles based on the Customer model, as Vehicle might have a ForeignKey relationship with Customer, not directly with User.
Find the Customer object for the user: Before querying the Vehicle, you need to get the associated Customer instance for the user.

Updated steps:

Fetch the Customer instance for the user:

python
customer = user.customer  # Assuming each user has a customer instance linked with a one-to-one relationship

Now filter the vehicles associated with this customer:

python
vehicles = Vehicle.objects.filter(customer=customer)
print(vehicles)

Let me know if this works!

The issue with the "Select Service" field being empty could be due to a couple of reasons:

Empty Service Objects:
- Ensure that there are actual Service records in the database. If the Service.objects.all() query returns an empty queryset, the "Select Service" dropdown will appear empty.
You can check this by running the following in the shell:
```
python
from core.models import Service
print(Service.objects.all())  # Should print a list of services
```
Form Initialization:
- Check that the ServiceRequestForm is properly initialized with the user context, which should assign the correct queryset for the service field.
Template Rendering:
- Ensure that the form is correctly rendered in the template and that the form.service is properly passed to the template. Double-check that you are rendering the form correctly in your template:
```
html
<label class="form-label">{{ form.service.label }}</label>
{{ form.service }}
```
Database Integrity:
- Ensure that there is no issue with your database migrations or foreign key relationships in the Service model.

You can verify the services being populated by checking your database or making sure there are no issues with model relationships. If there are no Service objects in the database, that would explain why the dropdown is empty.

Let me know if you want more detailed checks!

from django.shortcuts import render, redirect from core.models import Service from django.contrib.auth.decorators import login_required from billing.models import Booking, Vehicle from .forms import ServiceRequestForm def services_home(request): services = Service.objects.all() # Fetch services from DB return render(request, 'services/home.html', {'services': services}) def service_list(request): services = [ { "name": "Oil Change", "description": "Keep your engine running smoothly with our premium oil change service.", "price": "Ksh 6,500", "image": "images/oil_change.png", }, { "name": "Car Diagnostics", "description": "Advanced vehicle diagnostics to detect and resolve issues quickly.", "price": "Ksh 9,100", "image": "images/diagnostics.jpg", }, { "name": "Brake Repair", "description": "Ensure your safety with professional brake repair and replacement services.", "price": "Ksh 13,000", "image": "images/brake_repair.jpg", }, { "name": "Battery Replacement", "description": "Fast and reliable battery testing and replacement services.", "price": "Ksh 10,400", "image": "images/battery_replacement.jpg", }, { "name": "Tire Rotation & Balancing", "description": "Extend the life of your tires with proper rotation and balancing.", "price": "Ksh 7,800", "image": "images/tire_rotation.jpg", }, { "name": "Full Car Service", "description": "Comprehensive maintenance to keep your car in peak condition.", "price": "Ksh 26,000", "image": "images/full_service.jpg", }, ] return render(request, 'services/service_list.html', {'services': services}) @login_required def request_service(request): user = request.user # Get the logged-in user if request.method == "POST": form = ServiceRequestForm(request.POST, user=user) # Pass user to form if form.is_valid(): service = form.cleaned_data["service"] vehicle = form.cleaned_data["vehicle"] Booking.objects.create(user=user, vehicle=vehicle, service=service) return redirect("services:request_success") # Redirect after successful booking else: form = ServiceRequestForm(user=user) # Ensure form is initialized correctly here are the views return render(request, "services/request_service.html", {"form": form})

The code you provided seems mostly correct, but there are a couple of things to ensure that the "Select Service" dropdown isn't empty. Here’s a quick checklist and some additional recommendations for the views:

Checklist:

Database Population for Services:
- You are using Service.objects.all() to populate the "Select Service" dropdown. Ensure that there are actually records in your Service model. If there are no records, the dropdown will be empty.
- You can check if your database has the services by running:
```
python
from core.models import Service
print(Service.objects.all())  # This should list the services if any exist.
```
Form Initialization with the User Context:
- You are passing the user=user parameter to the form when it’s initialized. This looks good, but ensure that the ServiceRequestForm is accepting and utilizing the user parameter to filter vehicles correctly (which you already seem to be doing).
HTML Template Rendering:
- In the form rendering, ensure that the {{ form.service }} is correctly placed and rendered in the template. You have it correctly in the code you shared earlier, but double-check if it’s rendering correctly on the frontend.

Updated Views Code:

python
@login_required
def request_service(request):
    user = request.user  # Get the logged-in user
    services = Service.objects.all()  # Fetch services from DB

    if request.method == "POST":
        form = ServiceRequestForm(request.POST, user=user)  # Pass user to form
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]
            Booking.objects.create(user=user, vehicle=vehicle, service=service)
            return redirect("services:request_success")  # Redirect after successful booking
    else:
        form = ServiceRequestForm(user=user)  # Ensure form is initialized correctly

    return render(request, "services/request_service.html", {"form": form, "services": services})

Service Request Form Debugging:

In your ServiceRequestForm, ensure that the service field is getting populated with data from Service.objects.all().

python
from django import forms
from core.models import Service
from billing.models import Vehicle  # Assuming Vehicle is in billing.models

class ServiceRequestForm(forms.Form):
    service = forms.ModelChoiceField(queryset=Service.objects.all(), label="Select Service")
    vehicle = forms.ModelChoiceField(queryset=Vehicle.objects.none(), label="Select Vehicle")

    def __init__(self, *args, **kwargs):
        user = kwargs.pop("user", None)
        super().__init__(*args, **kwargs)
        if user:
            self.fields["vehicle"].queryset = Vehicle.objects.filter(customer__user=user)

HTML Template (`request_service.html`):

In your template, double-check that the form.service field is rendered correctly:

html
{% extends "base.html" %}
{% block content %}
<div class="container mt-4">
    <h2>Request a Service</h2>
    <form method="post">
        {% csrf_token %}
        <div class="mb-3">
            <label class="form-label">{{ form.service.label }}</label>
            {{ form.service }}  <!-- Ensure this is rendering correctly -->
        </div>
        <div class="mb-3">
            <label class="form-label">{{ form.vehicle.label }}</label>
            {{ form.vehicle }}
        </div>
        <button type="submit" class="btn btn-primary">Submit Request</button>
    </form>
</div>
{% endblock %}

Additional Debugging Steps:

Check the Database:
- If the dropdown is still empty, check that there are Service objects in the database. You can add services via the Django Admin or the shell.
Check the Queryset in the Form:
- If there are Service objects in the database but they still aren't showing, you can try debugging the form.service.queryset in your view to see if it’s populated with the correct data:
```
python
print(form.fields['service'].queryset)  # Should print the queryset for services
```

Let me know if that helps, and if the issue persists, we can debug further!

If the Service model doesn't exist or isn't properly defined, that's the likely reason why your Select Service dropdown is empty.

Here’s how you can define the Service model in Django:

1. Define the `Service` Model:

In your core/models.py, you should define the Service model. A basic model could look like this:

python
from django.db import models

class Service(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField()
    price = models.DecimalField(max_digits=10, decimal_places=2)
    # You can add an image field if you want to associate images with services
    image = models.ImageField(upload_to='services/', blank=True, null=True)

    def __str__(self):
        return self.name

2. Run Migrations:

After adding the model to core/models.py, run the following commands to create and apply the migrations:

bash
python manage.py makemigrations
python manage.py migrate

This will create the Service table in your database.

3. Add Sample Data to the Admin (Optional):

To test that everything works, you can add some sample services through the Django admin interface.

Register the Service model in core/admin.py:

python
from django.contrib import admin
from .models import Service

admin.site.register(Service)

Create Services in Admin: After registering the model, go to the Django admin interface (/admin) and add a few Service objects manually to ensure they are present in the database.

4. Update the `ServiceRequestForm` to Use `Service` Model:

Now that the Service model is created, your form should correctly populate the "Select Service" dropdown.

python
from django import forms
from core.models import Service
from billing.models import Vehicle  # Assuming Vehicle is in billing.models

class ServiceRequestForm(forms.Form):
    service = forms.ModelChoiceField(queryset=Service.objects.all(), label="Select Service")
    vehicle = forms.ModelChoiceField(queryset=Vehicle.objects.none(), label="Select Vehicle")

    def __init__(self, *args, **kwargs):
        user = kwargs.pop("user", None)
        super().__init__(*args, **kwargs)
        if user:
            self.fields["vehicle"].queryset = Vehicle.objects.filter(customer__user=user)

5. Verify:

After running the migration and adding services, restart the server and check the dropdown again to see if the services appear.

Let me know how it goes! If you have any other questions or run into issues, feel free to ask.

from django.conf import settings from django.db import models class Booking(models.Model): SERVICE_CHOICES = [ ('oil_change', 'Oil Change'), ('brake_check', 'Brake Check'), ('tire_replacement', 'Tire Replacement'), ('engine_diagnosis', 'Engine Diagnosis'), ] STATUS_CHOICES = [ ('pending', 'Pending'), ('approved', 'Approved'), ('in_progress', 'In Progress'), ('completed', 'Completed'), ('cancelled', 'Cancelled'), ] user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE) name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) service = models.CharField(max_length=50, choices=SERVICE_CHOICES) date = models.DateField() message = models.TextField(blank=True, null=True) status = models.CharField(max_length=11, choices=STATUS_CHOICES, default='pending') mechanic = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL,null=True, blank=True, related_name="mechanic_bookings") created_at = models.DateTimeField(auto_now_add=True) def __str__(self): return f"{self.name} - {self.service} on {self.date}" class Service(models.Model): name = models.CharField(max_length=100, unique=True) description = models.TextField(blank=True, null=True) estimated_time = models.DurationField(help_text="Estimated completion time") price = models.DecimalField(max_digits=10, decimal_places=2) created_at = models.DateTimeField(auto_now_add=True) def __str__(self): return self.name core>models.py

It looks like you've successfully defined the Booking and Service models in your core/models.py. This should work well for your ServiceRequestForm, assuming the Service model is now in place.

Here are a few things to ensure:

1. Service Model

Your Service model looks good, with essential fields like name, description, estimated_time, and price.

2. Booking Model

The Booking model is well-structured, and I see you're using ForeignKey relationships for both the user and the mechanic. You're using CharField with choices for the service and status, which is appropriate. The only thing to ensure is that you're linking the correct user as the customer and mechanic.

3. Migration

Since you've added the Service and Booking models, don’t forget to make and apply migrations to ensure your database schema is updated:

bash
python manage.py makemigrations
python manage.py migrate

4. Forms (Updated with Service Model)

In the ServiceRequestForm, make sure you're correctly querying the Service model for the available services:

python
from django import forms
from core.models import Service
from billing.models import Vehicle  # Assuming Vehicle is in billing.models

class ServiceRequestForm(forms.Form):
    service = forms.ModelChoiceField(queryset=Service.objects.all(), label="Select Service")
    vehicle = forms.ModelChoiceField(queryset=Vehicle.objects.none(), label="Select Vehicle")

    def __init__(self, *args, **kwargs):
        user = kwargs.pop("user", None)
        super().__init__(*args, **kwargs)
        if user:
            self.fields["vehicle"].queryset = Vehicle.objects.filter(customer__user=user)

This will ensure that the "Select Service" dropdown is populated with the available services from the Service model.

5. Admin (Optional)

To easily manage Service objects, you may want to register them in the Django admin:

python
from django.contrib import admin
from .models import Service, Booking

admin.site.register(Service)
admin.site.register(Booking)

6. Testing

Make sure you've added some sample services to the database. You can use the Django admin or shell to create a few service objects:

python
from core.models import Service
Service.objects.create(name="Oil Change", description="Premium oil change service", estimated_time="02:00:00", price=6500)
Service.objects.create(name="Brake Check", description="Brake inspection and checkup", estimated_time="01:30:00", price=1500)

7. Check the Dropdown

Now, with the above setup, the Select Service dropdown in the form should be populated with the services you created in the database.

Let me know if it works or if you encounter any issues!

It seems you're working with a billing app, and you're likely trying to define models for your vehicles and any related billing information (e.g., invoices, payments). Below is a possible example of what your billing/models.py file might look like based on your previous descriptions:

`billing/models.py`

python
from django.db import models
from django.conf import settings
from core.models import Service  # Assuming the Service model is in the core app

class Customer(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    phone_number = models.CharField(max_length=15)
    address = models.TextField()

    def __str__(self):
        return f"{self.user.username} - {self.phone_number}"

class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE, related_name='vehicles')
    make = models.CharField(max_length=50)
    model = models.CharField(max_length=50)
    year = models.IntegerField()
    license_plate = models.CharField(max_length=15)

    def __str__(self):
        return f"{self.make} {self.model} - {self.license_plate}"

class Invoice(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    service = models.ForeignKey(Service, on_delete=models.CASCADE)
    amount = models.DecimalField(max_digits=10, decimal_places=2)
    issued_at = models.DateTimeField(auto_now_add=True)
    due_date = models.DateTimeField()
    paid = models.BooleanField(default=False)

    def __str__(self):
        return f"Invoice for {self.customer.user.username} - {self.service.name}"

class Payment(models.Model):
    invoice = models.ForeignKey(Invoice, on_delete=models.CASCADE)
    amount = models.DecimalField(max_digits=10, decimal_places=2)
    payment_date = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"Payment of {self.amount} for Invoice {self.invoice.id}"

Explanation:

Customer Model:
- A Customer is linked to the User model via a one-to-one relationship (OneToOneField). This ensures that each user can have one associated customer profile.
- It stores contact details like phone_number and address.
Vehicle Model:
- The Vehicle model is linked to the Customer model using a foreign key. This means each customer can have multiple vehicles.
- The vehicle information includes the make, model, year, and license_plate.
Invoice Model:
- The Invoice model is related to both the Customer and the Service models.
- It stores the amount, due_date, and whether the invoice has been paid.
- The amount could be calculated based on the service cost and any other factors (e.g., additional parts).
Payment Model:
- The Payment model is linked to the Invoice model. Each payment corresponds to an invoice and has an amount and payment_date.

Admin Setup (Optional)

If you'd like to manage the above models in the Django admin interface, you can add an admin configuration like this in billing/admin.py:

python
from django.contrib import admin
from .models import Customer, Vehicle, Invoice, Payment

admin.site.register(Customer)
admin.site.register(Vehicle)
admin.site.register(Invoice)
admin.site.register(Payment)

Migrations

After defining or updating your models, don’t forget to create and apply migrations:

bash
python manage.py makemigrations
python manage.py migrate

Notes:

You may want to add some validation logic or additional fields depending on your business logic (e.g., for payment dates or invoice due dates).
The Invoice model assumes that the Service model (from your core app) has been defined correctly, with pricing information.

Let me know if you'd like more details or adjustments!

Your billing/models.py file looks well-structured, and the relationships between the models are defined clearly. Here's a breakdown and some suggestions to further enhance the code:

1. Customer Model

The Customer model has a OneToOneField to the CustomUser model, which ensures that each customer corresponds to a specific user.
The name, email, and phone fields capture basic customer details, which is good.

2. Vehicle Model

The Vehicle model stores the vehicle-related data, such as the make, model, and registration number.
The ForeignKey to the Customer model ensures that each vehicle is linked to a specific customer.

3. Service Model

The Service model defines different services offered (e.g., oil change, tire replacement).
The cost field is a DecimalField, which is suitable for representing service prices.

4. Part Model

The Part model stores details of individual parts that might be used in the vehicle service (e.g., brake pads, filters).
The cost field represents the price of each part.

5. Booking Model

The Booking model is used to store details of when a service has been booked for a vehicle.
The ForeignKey to CustomUser allows you to associate a booking with a specific user (e.g., customer).
The ForeignKey to Vehicle ensures that each booking corresponds to a particular vehicle.
The ForeignKey to Service links the booking to a specific service.

6. Billing Model

The Billing model stores the billing information for a service booking, including the service cost and any parts used.
The calculate_total method computes the total cost by adding the service cost and the cost of parts (if applicable).
The save method ensures that the total_cost is recalculated whenever the billing is saved.
The payment_method and payment_amount fields allow tracking of how the payment was made.

Improvement Suggestion:

In the Billing model, you may want to add a validation to ensure that the part_quantity is a positive integer (e.g., using validators=[MinValueValidator(1)]).

7. Invoice Model

The Invoice model is linked to a specific Billing record using a OneToOneField.
The invoice_number is generated dynamically based on the id, which is a good approach.
The total_amount and payment_status are fields that track the invoice status.

Improvement Suggestion:

You may want to ensure that the payment_status is updated automatically when the Billing payment is confirmed. This can be achieved through signals or within the save method of the Invoice model.

Code Improvements

Here are a few possible improvements to your models:

Ensure part_quantity is positive: Add a validator to part_quantity to ensure it's always positive:

python
from django.core.validators import MinValueValidator

part_quantity = models.IntegerField(default=1, validators=[MinValueValidator(1)])

Automatic Invoice Payment Status Update: When the payment for the Billing is made, you might want to automatically update the Invoice status. You could achieve this by overriding the save method in the Billing model or using Django signals. For instance:

python
from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=Billing)
def update_invoice_payment_status(sender, instance, **kwargs):
    if instance.payment_amount >= instance.total_cost:
        instance.invoice.payment_status = 'Paid'
        instance.invoice.save()

Add unique_together for Booking: To prevent a user from booking the same service for the same vehicle at the same time, you might want to enforce a unique constraint on the Booking model:
```
python
class Booking(models.Model):
    # Your fields...
    
    class Meta:
        unique_together = ['user', 'vehicle', 'service', 'date']
```

Calculate total_amount in the Invoice save method: Instead of manually setting the total_amount in the Invoice save method, you could retrieve it directly from the related Billing:

python
def save(self, *args, **kwargs):
    if not self.invoice_number:
        super().save(*args, **kwargs)  # Save first to get a PK
        self.invoice_number = self.generate_invoice_number()
    self.total_amount = self.billing.total_cost  # Ensure total amount is copied from billing
    super().save(*args, **kwargs)  # Save again with invoice number

Create ServiceRequest Form Validation: If you have forms related to the ServiceRequest (e.g., booking a service), make sure to handle the validation correctly by checking the relationship between the service and vehicle.

Conclusion

Your models seem to have a good foundation for a billing system within a vehicle service management system. With a few tweaks and improvements, it should work well for handling the booking, billing, and invoicing of vehicle services. Let me know if you need further assistance or additional features!

Let's focus on the Service functionality in your system. Since your Service model is already defined in your billing/models.py file, I assume you want to:

Display services in the frontend.
Allow users to request services through a form (which you've already started in the views).
Link services to bookings and invoices.

Here are the key steps we'll take to work on the Service functionality:

1. Service Model Setup

Your Service model looks like this:

python
class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

This model holds basic service information, such as the name and cost of the service. You can expand this to include additional details, such as a description or estimated time for completion.

Possible Enhancements:

Add description and estimated_time fields for more service details:

python
description = models.TextField(blank=True, null=True)
estimated_time = models.DurationField(help_text="Estimated time to complete the service")

2. Service Display in the Frontend

To display the services in your frontend (home.html and service_list.html), we can use the services_home view that fetches the Service model objects.

In `views.py`:

python
def services_home(request):
    services = Service.objects.all()  # Fetch services from DB
    return render(request, 'services/home.html', {'services': services})

This view passes the services to the template where they can be displayed.

In `home.html`:

html
{% for service in services %}
  <div class="service">
    <h3>{{ service.name }}</h3>
    <p>{{ service.description }}</p>
    <p>Cost: KSH {{ service.cost }}</p>
  </div>
{% endfor %}

This loop will render each service's name, description, and cost.

3. Service Request Form

You've already created a form for requesting services with ServiceRequestForm. Here's how to make sure it's working with services:

In `forms.py`:

python
from django import forms
from .models import Service
from billing.models import Vehicle  # Assuming Vehicle is in the billing app

class ServiceRequestForm(forms.Form):
    vehicle = forms.ModelChoiceField(queryset=Vehicle.objects.all(), label="Select Vehicle")
    service = forms.ModelChoiceField(queryset=Service.objects.all(), label="Select Service")
    date = forms.DateField(widget=forms.SelectDateWidget)
    message = forms.CharField(widget=forms.Textarea, required=False)

This form allows the user to select a vehicle and a service. Once submitted, the Booking is created.

4. Handling Service Requests

In the request_service view, when the form is submitted, the selected service is used to create a booking:

In `views.py` (updated `request_service` function):

python
@login_required
def request_service(request):
    user = request.user  # Get the logged-in user

    if request.method == "POST":
        form = ServiceRequestForm(request.POST)  # Pass the form data
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]
            date = form.cleaned_data["date"]
            message = form.cleaned_data["message"]

            # Create a booking
            Booking.objects.create(
                user=user,
                vehicle=vehicle,
                service=service,
                date=date,
                message=message,
            )
            return redirect("services:request_success")  # Redirect after successful booking
    else:
        form = ServiceRequestForm()  # If not POST, initialize an empty form

    return render(request, "services/request_service.html", {"form": form})

In the view above:

A booking is created using the selected vehicle, service, and other form data.
After the booking is created, the user is redirected to a success page.

`request_service.html` Template:

html
<form method="POST">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Request Service</button>
</form>

5. Booking Confirmation

After submitting the service request, you might want to show a confirmation or success page:

`views.py` for success page:

python
def request_success(request):
    return render(request, "services/request_success.html")

`request_success.html`:

html
<h3>Your service request has been successfully submitted!</h3>
<p>We will contact you shortly to confirm your booking.</p>

6. Invoice Generation

Once a service is booked and paid for, you can generate an invoice by linking the Billing and Invoice models.

In `views.py`:

You can add a view to display the invoice after payment:

python
def generate_invoice(request, booking_id):
    booking = Booking.objects.get(id=booking_id)
    billing = Billing.objects.get(booking=booking)  # Assuming there's one billing per booking
    invoice = Invoice.objects.create(billing=billing)
    
    return render(request, "services/invoice.html", {"invoice": invoice})

In `invoice.html`:

html
<h3>Invoice: {{ invoice.invoice_number }}</h3>
<p>Date: {{ invoice.date_created }}</p>
<p>Total Amount: KSH {{ invoice.total_amount }}</p>
<p>Status: {{ invoice.payment_status }}</p>

Conclusion

This approach integrates the Service model into the system, allowing users to select a service, book it, and generate an invoice. Each part of the process — from requesting a service to generating an invoice — is linked, and the service data is used throughout.

Let me know if you need additional features or adjustments!

{% extends "base.html" %} {% block content %} <div class="container mt-4"> <h2>Request a Service</h2> <form method="post"> {% csrf_token %} <div class="mb-3"> <label class="form-label">{{ form.service.label }}</label> {{ form.service }}  </div> <div class="mb-3"> <label class="form-label">{{ form.vehicle.label }}</label> {{ form.vehicle }} </div> <button type="submit" class="btn btn-primary">Submit Request</button> </form> </div> {% endblock %} update with above

To update your request_service.html template based on the provided structure, here's the modified version:

html
{% extends "base.html" %}

{% block content %}
<div class="container mt-4">
    <h2>Request a Service</h2>
    <form method="post">
        {% csrf_token %}
        
        <div class="mb-3">
            <label class="form-label">{{ form.service.label }}</label>
            {{ form.service }}  <!-- Ensure this is rendering correctly -->
        </div>

        <div class="mb-3">
            <label class="form-label">{{ form.vehicle.label }}</label>
            {{ form.vehicle }}
        </div>

        <div class="mb-3">
            <label class="form-label">{{ form.date.label }}</label>
            {{ form.date }}
        </div>

        <div class="mb-3">
            <label class="form-label">{{ form.message.label }}</label>
            {{ form.message }}
        </div>

        <button type="submit" class="btn btn-primary">Submit Request</button>
    </form>
</div>
{% endblock %}

Explanation of Changes:

Form Fields Display:
I've updated the template to make sure that each field from your form is properly displayed:
- Service: The service dropdown is displayed with {{ form.service }}.
- Vehicle: The vehicle dropdown is displayed with {{ form.vehicle }}.
- Date: The date field is displayed with {{ form.date }}.
- Message: The message field (textarea) is rendered with {{ form.message }}.
CSS Classes for Styling:
Each form field is wrapped in a div with mb-3 class for spacing. This is to ensure that your form fields have proper margins, especially when using Bootstrap.
CSRF Token:
The {% csrf_token %} ensures that the form submission is secure.

Next Steps:

Check that each form field is rendering correctly in the browser.
Validate that the service request form is being submitted as expected.

This setup should work seamlessly, assuming the form fields are correctly defined in your ServiceRequestForm class. Let me know if you need further adjustments!

<div class="mb-3"> <label class="form-label">{{ form.service.label }}</label> {{ form.service }}  </div> i have nothing to select from can i select form the details in the view below from django.shortcuts import render, redirect from core.models import Service from django.contrib.auth.decorators import login_required from billing.models import Booking, Vehicle from .forms import ServiceRequestForm def services_home(request): services = Service.objects.all() # Fetch services from DB return render(request, 'services/home.html', {'services': services}) def service_list(request): services = [ { "name": "Oil Change", "description": "Keep your engine running smoothly with our premium oil change service.", "price": "Ksh 6,500", "image": "images/oil_change.png", }, { "name": "Car Diagnostics", "description": "Advanced vehicle diagnostics to detect and resolve issues quickly.", "price": "Ksh 9,100", "image": "images/diagnostics.jpg", }, { "name": "Brake Repair", "description": "Ensure your safety with professional brake repair and replacement services.", "price": "Ksh 13,000", "image": "images/brake_repair.jpg", }, { "name": "Battery Replacement", "description": "Fast and reliable battery testing and replacement services.", "price": "Ksh 10,400", "image": "images/battery_replacement.jpg", }, { "name": "Tire Rotation & Balancing", "description": "Extend the life of your tires with proper rotation and balancing.", "price": "Ksh 7,800", "image": "images/tire_rotation.jpg", }, { "name": "Full Car Service", "description": "Comprehensive maintenance to keep your car in peak condition.", "price": "Ksh 26,000", "image": "images/full_service.jpg", }, ] return render(request, 'services/service_list.html', {'services': services})

Your service selection dropdown is empty because you're not pulling the services from the database into your form.

🔹 Solution

Ensure ServiceRequestForm Dynamically Fetches Services
Use the Service model from the database, not hardcoded service data in service_list
Update Your Form Definition

✅ Fix Your `ServiceRequestForm`

Your form is likely missing a ModelChoiceField for services. Update your form (forms.py) like this:

python
from django import forms
from billing.models import Booking, Vehicle, Service

class ServiceRequestForm(forms.ModelForm):
    service = forms.ModelChoiceField(
        queryset=Service.objects.all(),  # Fetch services dynamically
        empty_label="Select a service",  # Optional placeholder text
        widget=forms.Select(attrs={'class': 'form-control'})  # Bootstrap styling
    )

    vehicle = forms.ModelChoiceField(
        queryset=Vehicle.objects.none(),  # Will be set dynamically in the view
        empty_label="Select your vehicle",
        widget=forms.Select(attrs={'class': 'form-control'})
    )

    class Meta:
        model = Booking
        fields = ['service', 'vehicle']

    def __init__(self, *args, user=None, **kwargs):
        super().__init__(*args, **kwargs)
        if user:
            self.fields['vehicle'].queryset = Vehicle.objects.filter(customer=user.customer)  # Fetch user's vehicles

✅ Update `request_service` View in `views.py`

Modify your request_service view so that the form loads services dynamically:

python
@login_required
def request_service(request):
    user = request.user  # Get the logged-in user

    if request.method == "POST":
        form = ServiceRequestForm(request.POST, user=user)  # Pass user to form
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]
            Booking.objects.create(user=user, vehicle=vehicle, service=service)
            return redirect("services:request_success")  # Redirect after successful booking
    else:
        form = ServiceRequestForm(user=user)  # Ensure form is initialized correctly

    return render(request, "services/request_service.html", {"form": form})

✅ Ensure Your `request_service.html` Uses Bootstrap for Styling

Check that your form template correctly renders the dropdown:

html
{% extends "base.html" %}

{% block content %}
<div class="container mt-4">
    <h2>Request a Service</h2>
    <form method="post">
        {% csrf_token %}

        <div class="mb-3">
            <label class="form-label">{{ form.service.label }}</label>
            {{ form.service }}
        </div>

        <div class="mb-3">
            <label class="form-label">{{ form.vehicle.label }}</label>
            {{ form.vehicle }}
        </div>

        <button type="submit" class="btn btn-primary">Submit Request</button>
    </form>
</div>
{% endblock %}

🔹 Why This Fix Works

✅ Services are now loaded from the database dynamically
✅ Users can only select their own vehicles
✅ Dropdown will no longer be empty

🔹 Next Steps

Restart your Django server:

nginx
python manage.py runserver

Go to /request-service/ and check if the dropdown is now populated. 🚀

Let me know if you need any tweaks! 😃

@login_required def request_service(request): user = request.user # Get the logged-in user if request.method == "POST": form = ServiceRequestForm(request.POST, user=user) # Pass the form data if form.is_valid(): service = form.cleaned_data["service"] vehicle = form.cleaned_data["vehicle"] date = form.cleaned_data["date"] message = form.cleaned_data["message"] # Create a booking Booking.objects.create( user=user, vehicle=vehicle, service=service, date=date, message=message, ) return redirect("services:request_success") # Redirect after successful booking else: form = ServiceRequestForm() # If not POST, initialize an empty form return render(request, "services/request_service.html", {"form": form}) update

Your current issue is that the form is not receiving the user instance, which means it cannot filter vehicles for the logged-in user. Here's the corrected version of your request_service view:

✅ Fix: Ensure the Form Receives the User Instance

Modify the view so that it correctly initializes ServiceRequestForm with the logged-in user:

python
@login_required
def request_service(request):
    user = request.user  # Get the logged-in user

    if request.method == "POST":
        form = ServiceRequestForm(request.POST, user=user)  # Pass user to form
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]
            date = form.cleaned_data["date"]
            message = form.cleaned_data["message"]

            # Create a booking
            Booking.objects.create(
                user=user,
                vehicle=vehicle,
                service=service,
                date=date,
                message=message,
            )
            return redirect("services:request_success")  # Redirect after successful booking
    else:
        form = ServiceRequestForm(user=user)  # ✅ Pass user when initializing the form

    return render(request, "services/request_service.html", {"form": form})

✅ Fix: Ensure Your `ServiceRequestForm` Filters Vehicles for the User

Your form should filter only the vehicles that belong to the logged-in user.

📌 Update Your `ServiceRequestForm` in `forms.py`

python
from django import forms
from billing.models import Booking, Vehicle, Service

class ServiceRequestForm(forms.ModelForm):
    service = forms.ModelChoiceField(
        queryset=Service.objects.all(),  # Fetch services dynamically
        empty_label="Select a service",
        widget=forms.Select(attrs={'class': 'form-control'})  # Bootstrap styling
    )

    vehicle = forms.ModelChoiceField(
        queryset=Vehicle.objects.none(),  # Will be set dynamically in __init__
        empty_label="Select your vehicle",
        widget=forms.Select(attrs={'class': 'form-control'})
    )

    date = forms.DateField(
        widget=forms.DateInput(attrs={'type': 'date', 'class': 'form-control'}),
        label="Preferred Date"
    )

    message = forms.CharField(
        widget=forms.Textarea(attrs={'class': 'form-control', 'rows': 3}),
        required=False
    )

    class Meta:
        model = Booking
        fields = ['service', 'vehicle', 'date', 'message']

    def __init__(self, *args, user=None, **kwargs):
        super().__init__(*args, **kwargs)
        if user:
            self.fields['vehicle'].queryset = Vehicle.objects.filter(customer=user.customer)  # Fetch user's vehicles

✅ Now Your Template Will Work Correctly

Make sure your form template request_service.html correctly renders the fields:

html
{% extends "base.html" %}

{% block content %}
<div class="container mt-4">
    <h2>Request a Service</h2>
    <form method="post">
        {% csrf_token %}

        <div class="mb-3">
            <label class="form-label">{{ form.service.label }}</label>
            {{ form.service }}
        </div>

        <div class="mb-3">
            <label class="form-label">{{ form.vehicle.label }}</label>
            {{ form.vehicle }}
        </div>

        <div class="mb-3">
            <label class="form-label">{{ form.date.label }}</label>
            {{ form.date }}
        </div>

        <div class="mb-3">
            <label class="form-label">{{ form.message.label }}</label>
            {{ form.message }}
        </div>

        <button type="submit" class="btn btn-primary">Submit Request</button>
    </form>
</div>
{% endblock %}

🔹 Why This Fix Works

✅ Services are now loaded dynamically from the database.
✅ Vehicles dropdown only shows vehicles belonging to the logged-in user.
✅ The form receives the user argument correctly, avoiding the empty vehicle selection issue.
✅ Bootstrap styling ensures clean UI.

🚀 Final Steps

Restart your Django server
```
sh
python manage.py runserver
```
Test the form at /request-service/
- You should now see the available services and only your vehicles in the dropdown.

Let me know if you need any more tweaks! 🚀🔥

TypeError at /services/request/ Booking() got unexpected keyword arguments: 'date', 'message' Request Method: POST Request URL: http://127.0.0.1:8000/services/request/ Django Version: 5.1.7 Exception Type: TypeError Exception Value: Booking() got unexpected keyword arguments: 'date', 'message' Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py, line 567, in __init__ Raised during: services.views.request_service Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Wed, 02 Apr 2025 08:20:23 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\auth\decorators.py, line 60, in _view_wrapper return view_func(request, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\services\views.py, line 66, in request_service Booking.objects.create( ^ … Local vars

Your error "Booking() got unexpected keyword arguments: 'date', 'message'" means that the Booking model does not have date or message fields but you are trying to pass them when creating a booking.

🔎 Fix: Update `request_service` to Match `Booking` Model

📌 Check Your `Booking` Model (billing/models.py)

Your Booking model has the following fields:

python
class Booking(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings", null=True, blank=True)
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings")
    created_at = models.DateTimeField(auto_now_add=True)  # ✅ This is the timestamp

✅ No date field
✅ No message field

So, your view is trying to save fields that don't exist in the model, causing the error.

✅ Fix: Remove `date` and `message` When Creating a Booking

📌 Update `request_service` View

Modify your request_service function to remove date and message:

python
@login_required
def request_service(request):
    user = request.user  # Get the logged-in user

    if request.method == "POST":
        form = ServiceRequestForm(request.POST, user=user)  # Pass user to form
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]

            # ✅ Create a Booking (without date & message)
            Booking.objects.create(
                user=user,
                vehicle=vehicle,
                service=service
            )
            return redirect("services:request_success")  # Redirect after successful booking
    else:
        form = ServiceRequestForm(user=user)  # ✅ Pass user when initializing the form

    return render(request, "services/request_service.html", {"form": form})

🎯 Alternative: If You Want to Save `date` and `message`

If you need to store date and message, you should add them to the Booking model:

📌 Update `Booking` Model (`billing/models.py`)

python
class Booking(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings", null=True, blank=True)
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings")
    date = models.DateField(null=True, blank=True)  # ✅ Add date
    message = models.TextField(null=True, blank=True)  # ✅ Add message
    created_at = models.DateTimeField(auto_now_add=True)  # Timestamp of booking

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

📌 Run Migrations

After adding date and message, run:

sh
python manage.py makemigrations billing
python manage.py migrate

Then, your original request_service view will work without errors. 🚀

🔥 Final Steps

✅ Restart your Django server

sh
python manage.py runserver

✅ Test the form at /services/request/

If you removed date and message, the form should work without changes.
If you added them to Booking, the new fields should now be saved properly.

Let me know if you need more help! 🚀

PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations billing It is impossible to change a nullable field 'user' on booking to non-nullable without providing a default. This is because the database needs something to populate existing rows. Please select a fix: 1) Provide a one-off default now (will be set on all existing rows with a null value for this column) 2) Ignore for now. Existing rows that contain NULL values will have to be handled manually, for example with a RunPython or RunSQL operation. 3) Quit and manually define a default value in models.py. Select an option:

This happens because you previously had user set as nullable (null=True, blank=True) in your Booking model. Now, Django is asking how to handle existing NULL values when making the field non-nullable.

✅ How to Fix It

Option 1: If You Want `user` to Be Required

If all Booking records must have a user, you need to:

1️⃣ Press 1 and provide a default user (like an admin).

Example: If your admin user ID is 1, enter:
```
python
1
```
This will update existing records with NULL user fields to use this user.

2️⃣ Run the migration

sh
python manage.py migrate billing

Option 2: Keep `user` Optional (Recommended If You Have Existing Data)

If some bookings shouldn't require a user, update your model:

python
user = models.ForeignKey(
    CustomUser, 
    on_delete=models.CASCADE, 
    related_name="customer_bookings", 
    null=True,  # ✅ Keep nullable
    blank=True  # ✅ Allow empty values
)

Then, retry:

sh
python manage.py makemigrations billing
python manage.py migrate billing

This way, Django won’t force you to set a default user. 🚀

Option 3: Manually Handle Data

If you have existing NULL values and don't want a default, you can update them manually in the database before running migrations.

1️⃣ Open Django shell

sh
python manage.py shell

2️⃣ Find and update bookings with no user

python
from billing.models import Booking
from accounts.models import CustomUser

default_user = CustomUser.objects.first()  # Get an existing user (change as needed)
Booking.objects.filter(user__isnull=True).update(user=default_user)

3️⃣ Exit shell & run migrations

sh
exit()
python manage.py makemigrations billing
python manage.py migrate billing

🔥 Which Option to Choose?

If all bookings need a user → Choose Option 1 and set a default user.
If bookings can exist without a user → Choose Option 2 (recommended).
If you want to update data manually → Use Option 3.

Try Option 2 first, and if you still face issues, let me know! 🚀

Since Django is asking for a default value, it expects a valid Python expression.

Since user is a ForeignKey to CustomUser, you need to provide an existing user ID.

🔹 What to Do Now?

✅ If You Have a User in Your Database

Enter an existing user ID:

python
1

(Replace 1 with a real user ID from your database.)

✅ If You're Not Sure About User IDs

1️⃣ Open the Django shell:

sh
python manage.py shell

2️⃣ Run this to check for available users:

python
from accounts.models import CustomUser
CustomUser.objects.values("id", "username")  # See user IDs

3️⃣ Pick an ID and enter it in the migration prompt.

❌ If You Don't Want a Default User

Press 3, update your model, and make user optional:

python
user = models.ForeignKey(
    CustomUser, on_delete=models.CASCADE, related_name="customer_bookings",
    null=True, blank=True  # ✅ Allow empty values
)

Then run:

sh
python manage.py makemigrations billing
python manage.py migrate billing

🚀 Best Option?

If all bookings should have a user, enter an existing user ID (Option 1).
If bookings can exist without a user, update the model and make user nullable (Option 3).

Let me know if you need help finding a user ID! 😊

Since Django is asking for a default value for the user field in Booking, here’s what you can do:

🔹 Best Options

✅ Option 1: Provide an Existing User ID

If you have users in your database, enter an existing user ID at the prompt:

python
1  # Replace with a valid user ID

This assigns all existing Booking records to the user with ID 1.

✅ Option 2: Make `user` Optional

If some bookings don’t need a user, update models.py to allow user to be null:

python
user = models.ForeignKey(
    CustomUser, on_delete=models.CASCADE, related_name="customer_bookings",
    null=True, blank=True  # ✅ Allow empty values
)

Then run:

sh
python manage.py makemigrations
python manage.py migrate

✅ Option 3: Manually Handle NULL Bookings

Choose 2 in the prompt:

sh
Select an option: 2

Then run a manual SQL update:

sh
python manage.py dbshell

Inside the DB shell (for SQLite or PostgreSQL):

sql
UPDATE billing_booking SET user_id = 1 WHERE user_id IS NULL;

(Replace 1 with an actual user ID.)

Then retry migrations:

sh
python manage.py makemigrations
python manage.py migrate

🚀 Best Solution?

If bookings must have a user ➝ Provide an existing user ID (Option 1).
If bookings don’t always have a user ➝ Make user optional (Option 2).
If you want full control ➝ Handle it manually (Option 3).

Let me know if you need help checking user IDs! 😊

🔹 Why is This Error Happening?

The error "Booking() got unexpected keyword arguments: 'date', 'message'" occurs because the Booking model does not have date and message fields, but your view is trying to create a Booking object with those fields.

🔍 Step 1: Check the `Booking` Model (billing/models.py)

Your Booking model looks like this:

python
class Booking(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings", null=True, blank=True)
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings")
    created_at = models.DateTimeField(auto_now_add=True)  # ✅ No "date" or "message" field!

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

🚨 Problem: There are no date or message fields in Booking, but your view tries to pass them.

🔧 Step 2: Fix the `request_service` View

Option 1: Remove `date` and `message` from the View

Since the Booking model doesn’t have these fields, remove them from the view:

python
@login_required
def request_service(request):
    user = request.user  # Get the logged-in user

    if request.method == "POST":
        form = ServiceRequestForm(request.POST, user=user)  # Pass the form data
        if form.is_valid():
            service = form.cleaned_data["service"]
            vehicle = form.cleaned_data["vehicle"]

            # ✅ Create a booking (without date and message)
            Booking.objects.create(
                user=user,
                vehicle=vehicle,
                service=service
            )
            return redirect("services:request_success")  # Redirect after successful booking
    else:
        form = ServiceRequestForm()  # If not POST, initialize an empty form

    return render(request, "services/request_service.html", {"form": form})

✔ This will work if Booking should not store date and message.

Option 2: Add `date` and `message` Fields to `Booking` Model

If you actually want date and message in the Booking model, update models.py:

python
class Booking(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings", null=True, blank=True)
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings")
    date = models.DateField(null=True, blank=True)  # ✅ Add date field
    message = models.TextField(blank=True, null=True)  # ✅ Add message field
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

Then run:

sh
python manage.py makemigrations
python manage.py migrate

✔ This will work if you need date and message in bookings.

✅ Best Solution?

If date and message are not needed, remove them from request_service (Option 1).
If date and message are needed, add them to the Booking model (Option 2).

Let me know which one fits your system better! 🚀😊

NoReverseMatch at /services/request/ Reverse for 'request_success' not found. 'request_success' is not a valid view function or pattern name. Request Method: POST Request URL: http://127.0.0.1:8000/services/request/ Django Version: 5.1.7 Exception Type: NoReverseMatch Exception Value: Reverse for 'request_success' not found. 'request_success' is not a valid view function or pattern name. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\urls\resolvers.py, line 831, in _reverse_with_prefix Raised during: services.views.request_service Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Wed, 02 Apr 2025 08:36:51 +0000

🔍 What's Causing This Error?

The error "NoReverseMatch: Reverse for 'request_success' not found" means that Django cannot find a URL pattern named 'request_success' when trying to redirect after a service request.

🔧 Step 1: Check Your `urls.py`

Open services/urls.py and look for a path like:

python
path("request_success/", views.request_success, name="request_success")

If it doesn't exist, add it:

python
from django.urls import path
from . import views

app_name = "services"  # Ensure the app has a namespace

urlpatterns = [
    path("request/", views.request_service, name="request_service"),
    path("request_success/", views.request_success, name="request_success"),  # ✅ Add this
]

🔧 Step 2: Create `request_success` View

If you don’t have request_success in views.py, create it:

python
from django.shortcuts import render

def request_success(request):
    return render(request, "services/request_success.html")

🔧 Step 3: Create `request_success.html` Template

Inside services/templates/services/request_success.html, create this simple success page:

html
{% extends "base.html" %}
{% block content %}
<div class="container mt-4">
    <h2>Service Request Successful</h2>
    <p>Your service request has been submitted successfully.</p>
    <a href="{% url 'services:service_list' %}" class="btn btn-primary">Go Back to Services</a>
</div>
{% endblock %}

🔄 Final Step: Restart the Server

Run:

sh
python manage.py runserver

✔ Now, Django will find 'request_success' and redirect correctly after submitting a service request! 🚀😃

🚀 Implementing "Track Service Progress" Feature

You want users to track the progress of their service requests. This means:

Listing the user's service bookings.
Displaying their status (e.g., "Pending", "In Progress", "Completed").
Providing a link to view booking details.

🛠 Step 1: Update `urls.py`

Add a URL for tracking service requests in services/urls.py:

python
from django.urls import path
from . import views

app_name = "services"

urlpatterns = [
    path("track/", views.track_service_progress, name="track_service_progress"),
]

🛠 Step 2: Create `track_service_progress` View

Modify services/views.py to retrieve the user's bookings:

python
from django.shortcuts import render
from billing.models import Booking

def track_service_progress(request):
    bookings = Booking.objects.filter(user=request.user).order_by("-created_at")  # Fetch user's bookings
    return render(request, "services/track_service.html", {"bookings": bookings})

🛠 Step 3: Create `track_service.html` Template

Create services/templates/services/track_service.html to display booking statuses:

html
{% extends "base.html" %}
{% block content %}
<div class="container mt-4">
    <h2>Track Your Service Progress</h2>
    {% if bookings %}
        <ul class="list-group">
            {% for booking in bookings %}
                <li class="list-group-item d-flex justify-content-between align-items-center">
                    <strong>{{ booking.service.name }}</strong> - {{ booking.vehicle.registration_number }}
                    <span class="badge bg-{% if booking.status == 'completed' %}success{% elif booking.status == 'in_progress' %}warning{% else %}secondary{% endif %}">
                        {{ booking.status|title }}
                    </span>
                    <a href="{% url 'services:booking_detail' booking.id %}" class="btn btn-primary btn-sm">View Details</a>
                </li>
            {% endfor %}
        </ul>
    {% else %}
        <p>No active service requests found.</p>
    {% endif %}
</div>
{% endblock %}

This: ✅ Lists all bookings for the logged-in user
✅ Displays the vehicle registration number
✅ Shows the current status with color badges
✅ Includes a "View Details" button (to be implemented)

🛠 Step 4: Add "Track Service Progress" Link

Update your navigation menu or dashboard:

html
<li class="list-group-item">
    <a href="{% url 'services:track_service_progress' %}">Track Service Progress</a>
</li>

🛠 Step 5: Restart Server & Test

Run:

sh
python manage.py runserver

✔ Now users can track their service requests in real-time! 🚗⚙️🔥

NoReverseMatch at /services/track/ Reverse for 'booking_detail' not found. 'booking_detail' is not a valid view function or pattern name. Request Method: GET Request URL: http://127.0.0.1:8000/services/track/ Django Version: 5.1.7 Exception Type: NoReverseMatch Exception Value: Reverse for 'booking_detail' not found. 'booking_detail' is not a valid view function or pattern name. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\urls\resolvers.py, line 831, in _reverse_with_prefix Raised during: services.views.track_service_progress Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Wed, 02 Apr 2025 09:23:33 +0000 Error during template rendering In template C:\Users\lau\Desktop\Projects\garage_system\services\templates\services\track_service.html, error at line 13 Reverse for 'booking_detail' not found. 'booking_detail' is not a valid view function or pattern name. 3 <div class="container mt-4"> 4 <h2>Track Your Service Progress</h2> 5 {% if bookings %} 6 <ul class="list-group"> 7 {% for booking in bookings %} 8 <li class="list-group-item d-flex justify-content-between align-items-center"> 9 <strong>{{ booking.service.name }}</strong> - {{ booking.vehicle.registration_number }} 10 <span class="badge bg-{% if booking.status == 'completed' %}success{% elif booking.status == 'in_progress' %}warning{% else %}secondary{% endif %}"> 11 {{ booking.status|title }} 12 </span> 13 <a href="{% url 'services:booking_detail' booking.id %}" class="btn btn-primary btn-sm">View Details</a> 14 </li> 15 {% endfor %} 16 </ul> 17 {% else %} 18 <p>No active service requests found.</p> 19 {% endif %} 20 </div> 21 {% endblock %} 22

🛠 Fixing the `NoReverseMatch` Error

The error occurs because the URL {% url 'services:booking_detail' booking.id %} does not exist in your services/urls.py. To fix this, we need to:

Define the booking_detail view in views.py.
Add a corresponding URL pattern in urls.py.
Ensure the correct namespace is used.

✅ Step 1: Add the `booking_detail` View

In services/views.py, create the booking_detail view:

python
from django.shortcuts import render, get_object_or_404
from billing.models import Booking

def booking_detail(request, booking_id):
    booking = get_object_or_404(Booking, id=booking_id)
    return render(request, "services/booking_detail.html", {"booking": booking})

This view: ✅ Fetches the booking using booking_id.
✅ Returns a 404 if the booking does not exist.
✅ Renders the booking_detail.html template.

✅ Step 2: Add the URL in `urls.py`

In services/urls.py, add:

python
path("booking/<int:booking_id>/", views.booking_detail, name="booking_detail"),

Your updated urls.py should look like this:

python
from django.urls import path
from . import views

app_name = "services"

urlpatterns = [
    path("track/", views.track_service_progress, name="track_service_progress"),
    path("booking/<int:booking_id>/", views.booking_detail, name="booking_detail"),
]

Now {% url 'services:booking_detail' booking.id %} will work correctly.

✅ Step 3: Create `booking_detail.html`

Create services/templates/services/booking_detail.html:

html
{% extends "base.html" %}
{% block content %}
<div class="container mt-4">
    <h2>Service Request Details</h2>
    <ul class="list-group">
        <li class="list-group-item"><strong>Service:</strong> {{ booking.service.name }}</li>
        <li class="list-group-item"><strong>Vehicle:</strong> {{ booking.vehicle.registration_number }}</li>
        <li class="list-group-item"><strong>Status:</strong> {{ booking.status|title }}</li>
        <li class="list-group-item"><strong>Requested On:</strong> {{ booking.created_at }}</li>
        <li class="list-group-item"><strong>Additional Notes:</strong> {{ booking.message|default:"No additional notes" }}</li>
    </ul>
    <a href="{% url 'services:track_service_progress' %}" class="btn btn-secondary mt-3">Back to Tracking</a>
</div>
{% endblock %}

This will: ✅ Display the booking details (service, vehicle, status, date, and message).
✅ Show a "Back to Tracking" button to return to the list of bookings.

🚀 Step 4: Restart the Server & Test

Now restart the Django server:

sh
python manage.py runserver

Then visit:

Track Service Progress: http://127.0.0.1:8000/services/track/
View Booking Details: Click "View Details" in the list.

✔ Done! You can now track service progress and view booking details 🎉🚗🔥

{% extends "base.html" %} {% block content %} <div class="container mt-4"> <h2>Track Your Service Progress</h2> {% if bookings %} <ul class="list-group"> {% for booking in bookings %} <li class="list-group-item d-flex justify-content-between align-items-center"> <strong>{{ booking.service.name }}</strong> - {{ booking.vehicle.registration_number }} <span class="badge bg-{% if booking.status == 'completed' %}success{% elif booking.status == 'in_progress' %}warning{% else %}secondary{% endif %}"> {{ booking.status|title }} </span> <a href="{% url 'services:booking_detail' booking.id %}" class="btn btn-primary btn-sm">View Details</a> </li> {% endfor %} </ul> {% else %} <p>No active service requests found.</p> {% endif %} </div> {% endblock %} design this to look nice and well organised

Here's an improved version of your service tracking page, designed to be more visually appealing and user-friendly using Bootstrap styling.

✨ Enhancements

✅ Improved layout with a clean card-based design.
✅ Better status indicators using colored badges.
✅ Mobile-friendly & responsive.
✅ Better spacing & alignment.

📌 Updated `track_service.html`

html
{% extends "base.html" %}
{% block content %}
<div class="container mt-5">
    <h2 class="text-center mb-4">🔍 Track Your Service Progress</h2>

    {% if bookings %}
        <div class="row">
            {% for booking in bookings %}
                <div class="col-md-6 col-lg-4 mb-4">
                    <div class="card shadow-sm border-0">
                        <div class="card-body">
                            <h5 class="card-title">
                                🚗 {{ booking.service.name }}
                            </h5>
                            <p class="card-text text-muted">
                                Vehicle: <strong>{{ booking.vehicle.registration_number }}</strong>
                            </p>

                            <!-- Status Badge -->
                            <span class="badge 
                                {% if booking.status == 'completed' %} bg-success 
                                {% elif booking.status == 'in_progress' %} bg-warning text-dark 
                                {% else %} bg-secondary {% endif %}">
                                {{ booking.status|title }}
                            </span>

                            <hr>
                            <div class="d-flex justify-content-between">
                                <small class="text-muted">📅 Requested: {{ booking.created_at|date:"F j, Y" }}</small>
                                <a href="{% url 'services:booking_detail' booking.id %}" class="btn btn-primary btn-sm">
                                    🔍 View Details
                                </a>
                            </div>
                        </div>
                    </div>
                </div>
            {% endfor %}
        </div>
    {% else %}
        <div class="alert alert-info text-center">
            🚘 No active service requests found.
        </div>
    {% endif %}
</div>
{% endblock %}

🎨 Design Enhancements

Cards for each booking:
- Gives a structured & clean look.
- Uses Bootstrap shadow & border styles for a modern touch.
Status Badge Styling:
- "Completed" → 🟢 Green
- "In Progress" → 🟡 Yellow
- "Pending" → ⚫ Gray
Responsive Layout:
- Displays 2 bookings per row on medium screens.
- Displays 3 bookings per row on large screens.
Subtle Icons for Better UX:
- 🚗 for service name
- 📅 for request date
- 🔍 for details button

✅ Final Result

📌 Mobile & Desktop Friendly Layout ✔ Better visibility of booking details.
✔ Clean & organized look.
✔ Easy navigation with "View Details" button.

Give it a try and let me know if you need any tweaks! 🚀🚘🔥

Great to hear that everything is working well! 🚀 Now, let's fix the status issue so that it displays correctly.

🔍 Possible Reasons Why Status Isn't Showing Properly

Check if status exists in the Booking model.
- Run this command to inspect the database:
```
bash
python manage.py shell
```
- Then, query a booking to check if status is stored correctly:
```
python
from billing.models import Booking
booking = Booking.objects.first()
print(booking.status)
```
- If this prints None, then the field might be missing or not set correctly.

Ensure status is stored as expected in the database.

Open your Booking model (models.py) and confirm the field exists:

python
class Booking(models.Model):
    STATUS_CHOICES = [
        ('pending', 'Pending'),
        ('in_progress', 'In Progress'),
        ('completed', 'Completed'),
    ]
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='pending')

If status is missing, add it and run:

bash
python manage.py makemigrations
python manage.py migrate

Ensure Data is Passed Correctly in the View

In your track_service_progress view, make sure bookings is correctly queried:

python
@login_required
def track_service_progress(request):
    bookings = Booking.objects.filter(user=request.user).order_by('-created_at')
    return render(request, "services/track_service.html", {"bookings": bookings})

This ensures only the logged-in user's bookings are fetched.

🛠 Final Fix: Adjust the Template Logic

If booking.status is still not displaying correctly, try printing it in the template:

html
<strong>Status Debug:</strong> {{ booking.status }}

If this shows a valid value (pending, in_progress, etc.), then the problem is in the badge logic.
Modify the badge to handle unexpected cases:

html
<span class="badge 
    {% if booking.status == 'completed' %} bg-success 
    {% elif booking.status == 'in_progress' %} bg-warning text-dark 
    {% elif booking.status == 'pending' %} bg-secondary 
    {% else %} bg-danger {% endif %}">
    {{ booking.get_status_display }}
</span>

Why get_status_display?
If status is stored as a choice field, get_status_display returns the human-readable version (e.g., "In Progress" instead of "in_progress").

🚀 Test & Confirm

✅ Run the app again
✅ Go to Track Service Progress
✅ Check if the status now displays correctly

Let me know if the issue persists! 🚘🔥

Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from billing.models import Booking >>> booking = Booking.objects.first() >>> print(booking.status) Traceback (most recent call last): File "<console>", line 1, in <module> AttributeError: 'Booking' object has no attribute 'status' >>>

🚨 Issue: `Booking` Model Has No `status` Field

The error AttributeError: 'Booking' object has no attribute 'status' means that the status field does not exist in your Booking model.

🛠 Fix: Add the `status` Field to the `Booking` Model

Open billing/models.py and add the status field inside the Booking model:

python
from django.db import models
from django.contrib.auth.models import User

class Booking(models.Model):
    STATUS_CHOICES = [
        ('pending', 'Pending'),
        ('in_progress', 'In Progress'),
        ('completed', 'Completed'),
    ]
    
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    vehicle = models.ForeignKey('Vehicle', on_delete=models.CASCADE)
    service = models.ForeignKey('Service', on_delete=models.CASCADE)
    date = models.DateTimeField(auto_now_add=True)
    message = models.TextField(blank=True, null=True)
    
    # ✅ Add this missing field
    status = models.CharField(
        max_length=20, 
        choices=STATUS_CHOICES, 
        default='pending'
    )

    def __str__(self):
        return f"{self.service.name} for {self.vehicle.registration_number} ({self.status})"

🔄 Apply the Changes

After adding the field, run these commands:

bash
python manage.py makemigrations billing
python manage.py migrate billing

If prompted about existing data when running migrations:

Choose 1 (Provide a one-off default) and type 'pending' (or whatever default you prefer).

✅ Test Again

Now, open the Python shell and check if status exists:

bash
python manage.py shell

Then run:

python
from billing.models import Booking
booking = Booking.objects.first()
print(booking.status)  # Should print 'pending', 'in_progress', or 'completed'

🎯 Final Step: Update Your Template

Now that status exists, ensure your template displays it correctly:

html
<span class="badge 
    {% if booking.status == 'completed' %} bg-success 
    {% elif booking.status == 'in_progress' %} bg-warning text-dark 
    {% else %} bg-secondary 
    {% endif %}">
    {{ booking.get_status_display }}
</span>

This ensures that:

✅ "Completed" shows in green
✅ "In Progress" shows in yellow
✅ "Pending" shows in gray

🚀 Try It Out!

Now, refresh your Track Service Progress page, and the status should be displayed correctly. Let me know if anything still needs fixing! 🚘🔥

core>models.py has the status from django.conf import settings from django.db import models class Booking(models.Model): SERVICE_CHOICES = [ ('oil_change', 'Oil Change'), ('brake_check', 'Brake Check'), ('tire_replacement', 'Tire Replacement'), ('engine_diagnosis', 'Engine Diagnosis'), ] STATUS_CHOICES = [ ('pending', 'Pending'), ('approved', 'Approved'), ('in_progress', 'In Progress'), ('completed', 'Completed'), ('cancelled', 'Cancelled'), ] user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE) name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) service = models.CharField(max_length=50, choices=SERVICE_CHOICES) date = models.DateField() message = models.TextField(blank=True, null=True) status = models.CharField(max_length=11, choices=STATUS_CHOICES, default='pending') mechanic = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL,null=True, blank=True, related_name="mechanic_bookings") created_at = models.DateTimeField(auto_now_add=True) def __str__(self): return f"{self.name} - {self.service} on {self.date}" class Service(models.Model): name = models.CharField(max_length=100, unique=True) description = models.TextField(blank=True, null=True) estimated_time = models.DurationField(help_text="Estimated completion time") price = models.DecimalField(max_digits=10, decimal_places=2) created_at = models.DateTimeField(auto_now_add=True) def __str__(self): return self.name can i use it instead

Yes, you should use the status field from the Booking model inside core/models.py. Since Booking is already defined there with a status field, you don't need to redefine it in billing/models.py.

🔹 How to Fix the `status` Issue

Since your Booking model already has status, let's check why it's not working.

✅ 1. Verify That You Are Using the Correct `Booking` Model

Ensure that when importing Booking in services/views.py, you're using:

python
from core.models import Booking  # ✅ Correct Import

instead of:

python
from billing.models import Booking  # ❌ Wrong Import

If the import is incorrect, update it to use the Booking model from core.models.

✅ 2. Run Migrations to Ensure `status` is in the Database

Even though the status field exists in models.py, it might not be applied in the database. Run:

bash
python manage.py makemigrations core
python manage.py migrate core

If prompted about existing rows, choose option 1 and type 'pending' as the default.

✅ 3. Test If `status` Exists in the Database

Open the Django shell and check:

bash
python manage.py shell

Then, run:

python
from core.models import Booking
booking = Booking.objects.first()
print(booking.status)  # Should print 'pending', 'approved', 'in_progress', etc.

If it prints a value, then status is working fine.

✅ 4. Fix Status Display in Your Template

Your status badge should use this code in track_service.html:

html
<span class="badge 
    {% if booking.status == 'completed' %} bg-success 
    {% elif booking.status == 'in_progress' %} bg-warning text-dark 
    {% elif booking.status == 'approved' %} bg-info 
    {% elif booking.status == 'cancelled' %} bg-danger 
    {% else %} bg-secondary 
    {% endif %}">
    {{ booking.get_status_display }}
</span>

✅ This will color the status labels properly.

🎯 Final Step: Refresh & Test

Restart your Django server:
```
bash
python manage.py runserver
```
Go to your "Track Service Progress" page and see if the statuses appear.

Let me know if anything still needs fixing! 🚀

{% extends "base.html" %} {% block content %} <div class="container mt-5"> <h2 class="text-center mb-4">🔍 Track Your Service Progress</h2> {% if bookings %} <div class="row"> {% for booking in bookings %} <div class="col-md-6 col-lg-4 mb-4"> <div class="card shadow-sm border-0"> <div class="card-body"> <h5 class="card-title"> 🚗 {{ booking.service.name }} </h5> <p class="card-text text-muted"> Vehicle: <strong>{{ booking.vehicle.registration_number }}</strong> </p>  <span class="badge {% if booking.status == 'completed' %} bg-success {% elif booking.status == 'in_progress' %} bg-warning text-dark {% else %} bg-secondary {% endif %}"> {{ booking.status|title }} </span> <hr> <div class="d-flex justify-content-between"> <small class="text-muted">📅 Requested: {{ booking.created_at|date:"F j, Y" }}</small> <a href="{% url 'services:booking_detail' booking.id %}" class="btn btn-primary btn-sm"> 🔍 View Details </a> </div> </div> </div> </div> {% endfor %} </div> {% else %} <div class="alert alert-info text-center"> 🚘 No active service requests found. </div> {% endif %} </div> {% endblock %} update

Here’s an improved version of your Track Service Progress template with a modern, clean design. I’ve added better spacing, color contrast, and a more intuitive layout for readability and usability. 🚀

🔹 Updates & Enhancements:

✅ Improved Card Styling: Better spacing, padding, and box-shadow for a clean UI.
✅ Enhanced Status Badges: Different colors for each status (pending, approved, in progress, completed, cancelled).
✅ Consistent Icons: Improved icons for clarity.
✅ Grid Optimization: Responsive layout for different screen sizes.

Updated Code

html
{% extends "base.html" %}
{% block content %}
<div class="container mt-5">
    <h2 class="text-center mb-4">🔍 Track Your Service Progress</h2>

    {% if bookings %}
        <div class="row">
            {% for booking in bookings %}
                <div class="col-md-6 col-lg-4 mb-4">
                    <div class="card shadow-lg border-0 rounded">
                        <div class="card-body">
                            <h5 class="card-title text-primary">
                                🚗 {{ booking.get_service_display }}
                            </h5>
                            <p class="card-text text-muted">
                                <strong>Vehicle:</strong> {{ booking.vehicle.registration_number }}
                            </p>

                            <!-- Status Badge -->
                            <span class="badge py-2 px-3 text-white fw-bold 
                                {% if booking.status == 'completed' %} bg-success 
                                {% elif booking.status == 'in_progress' %} bg-warning text-dark 
                                {% elif booking.status == 'approved' %} bg-info 
                                {% elif booking.status == 'cancelled' %} bg-danger 
                                {% else %} bg-secondary {% endif %}">
                                {{ booking.get_status_display }}
                            </span>

                            <hr>
                            <div class="d-flex justify-content-between align-items-center">
                                <small class="text-muted">📅 Requested: {{ booking.created_at|date:"F j, Y" }}</small>
                                <a href="{% url 'services:booking_detail' booking.id %}" class="btn btn-outline-primary btn-sm">
                                    🔍 View Details
                                </a>
                            </div>
                        </div>
                    </div>
                </div>
            {% endfor %}
        </div>
    {% else %}
        <div class="alert alert-info text-center p-4">
            🚘 No active service requests found.
        </div>
    {% endif %}
</div>
{% endblock %}

🎨 What’s Improved?

✅ Better UI:

Cards have rounded corners, shadows, and consistent padding.
Status badges have proper colors for different states.
Buttons and text are more readable and visually appealing.

✅ Fixed Issues:

Used {{ booking.get_service_display }} instead of {{ booking.service.name }} (for choices fields).
Used {{ booking.get_status_display }} to properly display human-readable status names.

✅ Mobile Friendly

The grid layout ensures proper alignment on desktop (3 columns), tablet (2 columns), and mobile (1 column).

🎯 Final Step: Refresh & Test

Restart your Django server:
```
bash
python manage.py runserver
```
Open Track Service Progress and check the UI! 🚀

Let me know if you need further tweaks! 🔥

Let's debug this issue step by step. Since the status field is not showing, we will check:

1️⃣ Does the Booking Model Have the Status Field?
2️⃣ Is the Status Field Available in the QuerySet?
3️⃣ Is the Template Rendering the Correct Data?

✅ Step 1: Check if the Status Field Exists in the Database

Run the following command in Django shell:

bash
python manage.py shell

Then, execute:

python
from billing.models import Booking

# Fetch the first booking
booking = Booking.objects.first()
print(booking)  # Should display the booking details
print(booking.status)  # Should display the status

🚨 If AttributeError: 'Booking' object has no attribute 'status' appears:
This means the database does not have the status field. Solution: Run migrations:

bash
python manage.py makemigrations
python manage.py migrate

Then try fetching the booking again.

✅ Step 2: Check if the Status Field is in the QuerySet

In your views.py, find the function that fetches bookings:

python
bookings = Booking.objects.all()

Modify it like this for debugging:

python
bookings = Booking.objects.all()
for booking in bookings:
    print(f"Booking ID: {booking.id}, Status: {booking.status}")

Restart the server and check if the status values are printed in the terminal.

🚨 If no status values are printed:

Make sure you migrated the database.
Check if status is correctly assigned when creating a booking.

✅ Step 3: Check if the Template is Using the Correct Field

Make sure you are using the correct status field in the template:

html
{{ booking.status }}

or if using choices, try:

html
{{ booking.get_status_display }}

Also, try adding this inside the template for debugging:

html
<p>Status: {{ booking.status }}</p>

Then check if it prints anything.

🔥 Final Step

Restart your Django server:
```
bash
python manage.py runserver
```
Refresh your browser and check the Track Service Progress page.

🚀 What to Do Next?

If the status field is missing in the database, you need to migrate again.
If the status is in the database but not showing in the template, make sure status is correctly passed in the context.
If still not working, share the view function handling track_service_progress.

Since your Booking model has a status field in models.py, but it's missing in the database, the issue is likely due to migrations not being applied correctly.

🚀 Step 1: Confirm Your Migration Files

Run the following command:

bash
python manage.py makemigrations billing

This will generate the necessary migration files for the billing app.
If it says "No changes detected", then your status field is missing from the migration history.

✅ Step 2: Check Existing Migrations

Run:

bash
ls billing/migrations/

(or on Windows, use dir billing\migrations\).
Check if there is a migration file that includes the status field.

If you are unsure, open the latest migration file in billing/migrations/ and look for something like this:

python
migrations.AddField(
    model_name='booking',
    name='status',
    field=models.CharField(choices=[('pending', 'Pending'), ('approved', 'Approved'), ('in_progress', 'In Progress'), ('completed', 'Completed'), ('cancelled', 'Cancelled')], default='pending', max_length=11),
),

If it's missing, Django never created a migration for status.

🔥 Step 3: Force Migrations

Run the following commands:

bash
python manage.py makemigrations --empty billing

This will create a new empty migration. Then, manually edit it (billing/migrations/XXXX_auto_someid.py) and add this inside operations = [...]:

python
migrations.AddField(
    model_name='booking',
    name='status',
    field=models.CharField(choices=[
        ('pending', 'Pending'),
        ('approved', 'Approved'),
        ('in_progress', 'In Progress'),
        ('completed', 'Completed'),
        ('cancelled', 'Cancelled'),
    ], default='pending', max_length=11),
),

Save and close the file.

Now apply the migration:

bash
python manage.py migrate billing

✅ Step 4: Verify That `status` Exists

Now, open Django shell again:

bash
python manage.py shell

And run:

python
from billing.models import Booking
booking = Booking.objects.first()
print(booking.status)  # Should now work

🚀 If this works, your status field is now correctly added to the database! 🎉

Let me know if you're still facing any issues.

To find the latest migration in your billing app, follow these steps:

✅ Method 1: Check the Migration Files

Run this command in your terminal:

bash
ls -lt billing/migrations/

(For Windows, use: dir billing\migrations\ /O:D)

This will list all migration files sorted by date, so the latest one will be at the top.

✅ Method 2: Check the Database

Run the following Django command:

bash
python manage.py showmigrations billing

It will output something like this:

csharp
billing
 [X] 0001_initial
 [X] 0002_auto_20240401_1234
 [X] 0003_add_status_field

The latest migration is the one at the bottom of the list.

✅ Method 3: Open the Migrations Folder

You can manually open the billing/migrations/ folder in VS Code, PyCharm, or File Explorer. The migration file with the highest number (e.g., 0005_auto_20250402_1432.py) is the latest.

Let me know what you find! 🚀

PS C:\Users\lau\Desktop\Projects\garage_system> dir billing\migrations\ Directory: C:\Users\lau\Desktop\Projects\garage_system\billing\migrations Mode LastWriteTime Length Name ---- ------------- ------ ---- d----- 4/1/2025 6:11 PM __pycache__ -a---- 3/31/2025 1:43 PM 3776 0001_initial.py -a---- 3/31/2025 7:13 PM 1447 0002_alter_billing_booking_alter_billing_part_and_more.py -a---- 3/31/2025 7:27 PM 1047 0003_invoice.py -a---- 3/31/2025 7:52 PM 427 0004_alter_invoice_invoice_number.py -a---- 4/1/2025 6:11 PM 664 0005_booking_user.py -a---- 3/30/2025 6:25 PM 0 __init__.py PS C:\Users\lau\Desktop\Projects\garage_system>

Your latest migration is 0005_booking_user.py (last modified on April 1, 2025, at 6:11 PM).

🔍 Possible Issues with `status` Not Showing

Since status is not found in your Booking model instance, here are the possible reasons:

✅ 1. Check if `status` was added in the latest migration

Run:

bash
python manage.py showmigrations billing

Look for 0005_booking_user. If it's not applied, apply it using:

bash
python manage.py migrate billing

✅ 2. Verify If `status` Exists in Your Database

Run:

bash
python manage.py dbshell

Then execute the following SQL query:

sql
PRAGMA table_info(billing_booking);

(If using PostgreSQL, use \d billing_booking; instead.)

Check if status is listed in the table.

✅ 3. If `status` is Missing, Create a New Migration

If status is missing from your database, create a new migration:

bash
python manage.py makemigrations billing
python manage.py migrate billing

✅ 4. Verify if Bookings Have the `status` Field

After fixing migrations, try this again in Python shell:

python
from billing.models import Booking
booking = Booking.objects.first()
print(booking.status)  # Should print 'pending' or another status

Let me know what happens! 🚀

Since you can see the status field in your database, let's debug it step by step using the Django shell.

🔍 1. Open Django Shell

Run this command in your terminal:

bash
python manage.py shell

🔍 2. Check if `Booking` Objects Have `status`

Run the following:

python
from billing.models import Booking

# Fetch the first booking
booking = Booking.objects.first()

# Print the booking to confirm it exists
print(booking)

# Print all fields in the booking object
print(vars(booking))  # This will list all available attributes

# Print the status field directly
print(booking.status)

✅ Expected Output

If vars(booking) shows status, but booking.status still gives an error, we might need to refresh the model.
If vars(booking) doesn't contain status, the model might be outdated.

🔍 3. Check If `Booking` Model is Updated

Sometimes, Django might be using an old model version. Run:

python
from django.apps import apps
Booking = apps.get_model('billing', 'Booking')

# Fetch the first booking again
booking = Booking.objects.first()
print(vars(booking))  # Check all fields
print(booking.status)  # Check if status is available

🔍 4. Check If the Field is in the Database

To verify the status field exists at the database level, run:

bash
python manage.py dbshell

Then execute:

sql
PRAGMA table_info(billing_booking);

(If using PostgreSQL, run \d billing_booking; instead.)

Check if status is listed.

🔍 5. If `status` Exists, But Django Can't See It

If status is in the database but missing in Django:

Restart your Django shell:

bash
exit
python manage.py shell

Clear Django migrations and reapply them:

bash
python manage.py makemigrations billing
python manage.py migrate billing

🚀 Try These and Let Me Know the Output!

Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from billing.models import Booking >>> >>> # Fetch the first booking >>> booking = Booking.objects.first() >>> >>> # Print the booking to confirm it exists >>> print(booking) KYM 914 - Basic Maintenance >>> >>> # Print all fields in the booking object >>> print(vars(booking)) # This will list all available attributes {'_state': <django.db.models.base.ModelState object at 0x0000011075F0CD10>, 'id': 2, 'user_id': None, 'vehicle_id': 8, 'service_id': 1, 'created_at': datetime.datetime(2025, 3, 31, 16, 30, 7, 287422, tzinfo=datetime.timezone.utc)} >>> >>> # Print the status field directly >>> print(booking.status) Traceback (most recent call last): File "<console>", line 1, in <module> AttributeError: 'Booking' object has no attribute 'status' >>>

The status field is missing from the Booking object, meaning Django doesn't recognize it. However, you mentioned that it exists in your database under core>booking. Let's fix this step by step.

🚀 1. Verify the Current Database Schema

Since Django isn't seeing the status field, let's check if it actually exists in the database.

🔹 Check the Database Directly

Run:

bash
python manage.py dbshell

Then, execute this SQL command:

sql
PRAGMA table_info(billing_booking);

(If using PostgreSQL, use \d billing_booking; instead.)

This should list all the columns in the billing_booking table. Check if status is there.

✅ If status exists → Django migrations might not be applied properly.
❌ If status is missing → The migration didn't run correctly.

🚀 2. Check If a Migration Was Created for `status`

Run:

bash
python manage.py showmigrations billing

Look for a migration that added status. If it’s missing, you need to recreate and apply migrations.

🚀 3. Manually Refresh Migrations

Since the model defines status, but Django isn't recognizing it, we need to ensure Django syncs with the database.

🔹 Step 1: Fake the Initial Migrations

If Django thinks the migrations were applied when they weren’t:

bash
python manage.py migrate billing zero  # Rolls back all migrations in billing
python manage.py makemigrations billing  # Creates new migrations
python manage.py migrate billing --fake-initial  # Applies them without errors

🔹 Step 2: Reset the Database (If Necessary)

If the issue persists and it's a local development environment, reset the database:

bash
python manage.py flush  # WARNING: Deletes all data!
python manage.py migrate  # Reapplies all migrations

🚀 4. Restart Everything

Exit the shell: Type exit()
Stop the Django server (CTRL+C in the terminal)
Restart the Django shell:
```
bash
python manage.py shell
```

Test Again:

python
from billing.models import Booking
booking = Booking.objects.first()
print(vars(booking))  # Should now include 'status'
print(booking.status)  # Should no longer give an error

💡 Summary

If status is missing from the database → Migration issue → Check PRAGMA table_info
If status exists but Django doesn't see it → Migration not applied → Reapply migrate
If all else fails → Reset and restart Django

🚀 Try these steps and let me know what happens!

Unapply all migrations: billing Running migrations: Rendering model states... DONE Unapplying billing.0004_alter_invoice_invoice_number... OK Unapplying billing.0003_invoice... OK Unapplying billing.0002_alter_billing_booking_alter_billing_part_and_more... OK Unapplying billing.0001_initial... OK PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from billing.models import Booking >>> booking = Booking.objects.first() Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sqlite3.OperationalError: no such table: billing_booking The above exception was the direct cause of the following exception: Traceback (most recent call last): File "<console>", line 1, in <module> File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1097, in first for obj in queryset[:1]: File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 400, in __iter__ self._fetch_all() File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1928, in _fetch_all self._result_cache = list(self._iterable_class(self)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 91, in __iter__ results = compiler.execute_sql( ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\compiler.py", line 1574, in execute_sql cursor.execute(sql, params) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 122, in execute return super().execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 79, in execute return self._execute_with_wrappers( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 92, in _execute_with_wrappers return executor(sql, params, many, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 100, in _execute with self.db.wrap_database_errors: File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ django.db.utils.OperationalError: no such table: billing_booking >>> print(vars(booking)) # Should now include 'status' Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'booking' is not defined. Did you mean: 'Booking'? >>> print(booking.status) # Should no longer give an error Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'booking' is not defined. Did you mean: 'Booking'? >>>

🚨 Issue: Table `billing_booking` is Missing

Since you unapplied all migrations, the billing_booking table no longer exists in your SQLite database. Now, we need to recreate and apply migrations properly.

✅ Fix the Issue Step by Step

🔹 1. Recreate Migrations

Run:

bash
python manage.py makemigrations billing

This should output something like:

bash
Migrations for 'billing':
  billing/migrations/0001_initial.py - Create model Booking

If no new migrations are created, force Django to detect changes:

bash
python manage.py makemigrations --empty billing

🔹 2. Apply the Migrations

Now, apply all migrations:

bash
python manage.py migrate billing

If you get errors, try:

bash
python manage.py migrate --fake-initial

🔹 3. Verify the Database

Check if the table exists now:

bash
python manage.py dbshell

Then run:

sql
PRAGMA table_info(billing_booking);

✅ If the status column appears, you're good to go!
❌ If not, delete and reset the database.

🔹 4. Reset the Database (If Needed)

If the table is still missing, reset the database (⚠ WARNING: This deletes all data):

bash
python manage.py flush
python manage.py migrate

Then, restart the Django shell:

bash
python manage.py shell

Test again:

python
from billing.models import Booking
booking = Booking.objects.first()
print(vars(booking))  # Should now include 'status'
print(booking.status)  # Should no longer give an error

🎯 Final Check

Try running the app again:

bash
python manage.py runserver

🚀 Let me know if you're still facing issues!

Ah, I see what you're asking! You have the Booking model in core instead of billing, but you're trying to access it from billing.models.

🔍 Debugging Step

Try this in your Django shell:

python
from core.models import Booking
booking = Booking.objects.first()
print(vars(booking))  # Check if status is present
print(booking.status)  # This should now work

If status is present in core.models.Booking, then your issue is that you're using the wrong model reference.

✅ Fix: Update References

Update Imports
- Wherever you're using from billing.models import Booking, change it to:
```
python
from core.models import Booking
```

Check Migrations for core Run:

bash
python manage.py makemigrations core
python manage.py migrate core

Verify in the Database

bash
python manage.py dbshell

Then run:

sql
PRAGMA table_info(core_booking);

If status is listed, you're good to go!

🎯 Final Step: Restart Server

Run:

bash
python manage.py runserver

Then check if your status field is showing in the UI.

🚀 Let me know if you need more help!

>>> print(vars(booking)) # Check if status is present {'_state': <django.db.models.base.ModelState object at 0x000002244E00D6A0>, 'id': 1, 'user_id': 1, 'name': 'laurence marete', 'email': 'laurencemmarete@gmail.com', 'phone': '0708632432', 'service': 'engine_diagnosis', 'date': datetime.date(2025, 3, 31), 'message': 'jkbjlnx;n;ms', 'status': 'Approved', 'mechanic_id': 3, 'created_at': datetime.datetime(2025, 3, 31, 10, 58, 17, 343469, tzinfo=datetime.timezone.utc)} >>> print(booking.status) # This should now work Approved >>>

Great! That means the status field exists and works correctly in your Booking model. 🎉

Now, if the status is not showing in your UI, let's check the following:

🛠️ Fix UI Issue

1️⃣ Make Sure You're Using the Correct Model in Views

Open your view function where you fetch bookings for the template.

Ensure you are using core.models.Booking and not billing.models.Booking.

Example (views.py in services app)

python
from core.models import Booking

def track_service_progress(request):
    bookings = Booking.objects.filter(user=request.user)
    return render(request, 'services/track_service.html', {'bookings': bookings})

2️⃣ Check the Template Variable Name

In track_service.html, confirm that booking.status is correct.

Example (Correct Way ✅)

html
<span class="badge 
      {% if booking.status == 'Completed' %} bg-success 
      {% elif booking.status == 'In Progress' %} bg-warning text-dark 
      {% else %} bg-secondary {% endif %}">
      {{ booking.status }}
</span>

Check Status Values: Since status is saved as "Approved", "Completed", etc., your template conditions must match case exactly.

Example:
- If database status is "Approved", but your template checks "approved" (lowercase), the badge won't work.
- Fix it by using:
```
html
{% if booking.status|lower == 'approved' %}
```

3️⃣ Restart Server

If you made any changes, restart Django:

bash
python manage.py runserver

🚀 Final Check

After these steps, refresh the page. If the status still doesn’t show, let me know what exactly appears in the UI (empty? wrong value? error message?).

File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 92, in _execute_with_wrappers return executor(sql, params, many, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 100, in _execute with self.db.wrap_database_errors: File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ django.db.utils.OperationalError: no such table: billing_booking [02/Apr/2025 13:08:16] "GET /services/track/ HTTP/1.1" 500 197118 {% extends "base.html" %} {% block content %} <div class="container mt-5"> <h2 class="text-center mb-4">🔍 Track Your Service Progress</h2> {% if bookings %} <div class="row"> {% for booking in bookings %} <div class="col-md-6 col-lg-4 mb-4"> <div class="card shadow-lg border-0 rounded"> <div class="card-body"> <h5 class="card-title text-primary"> 🚗 {{ booking.get_service_display }} </h5> <p class="card-text text-muted"> <strong>Vehicle:</strong> {{ booking.vehicle.registration_number }} </p>  <span class="badge py-2 px-3 text-white fw-bold {% if booking.status == 'completed' %} bg-success {% elif booking.status == 'in_progress' %} bg-warning text-dark {% elif booking.status == 'approved' %} bg-info {% elif booking.status == 'cancelled' %} bg-danger {% else %} bg-secondary {% endif %}"> {{ booking.status }} </span> <hr> <div class="d-flex justify-content-between align-items-center"> <small class="text-muted">📅 Requested: {{ booking.created_at|date:"F j, Y" }}</small> <a href="{% url 'services:booking_detail' booking.id %}" class="btn btn-outline-primary btn-sm"> 🔍 View Details </a> </div> </div> </div> </div> {% endfor %} </div> {% else %} <div class="alert alert-info text-center p-4"> 🚘 No active service requests found. </div> {% endif %} </div> {% endblock %}

Your error message django.db.utils.OperationalError: no such table: billing_booking means that the Booking table does not exist in the database. Since you recently unapplied all migrations, you need to reapply them to restore the table.

🛠️ Steps to Fix It

1️⃣ Run Migrations Again

Since we unrolled all migrations, let's recreate the database schema.

bash
python manage.py makemigrations billing
python manage.py migrate billing

If you have Booking in core.models instead of billing.models, then run:

bash
python manage.py makemigrations core
python manage.py migrate core

2️⃣ Verify Table Exists

After running the migrations, check if the Booking table exists:

bash
python manage.py shell

Then run:

python
from django.db import connection
print(connection.introspection.table_names())

If billing_booking or core_booking is missing, it means migrations were not applied properly.

3️⃣ Verify Status Exists in Model

Once migrations are successful, check if status is in the database:

bash
from billing.models import Booking  # or core.models if it's there
booking = Booking.objects.first()
print(vars(booking))

If status is missing, your model might not be updated in the database.

4️⃣ Restart the Server

After applying migrations, restart the Django server:

bash
python manage.py runserver

5️⃣ Confirm the Correct Model in Views

Check your views.py file and make sure you're using the correct model:

python
from billing.models import Booking  # or core.models if Booking is there

def track_service_progress(request):
    bookings = Booking.objects.filter(user=request.user)
    return render(request, 'services/track_service.html', {'bookings': bookings})

🚀 Final Check

Try accessing /services/track/ again.
If it still fails, copy the new error log so we can troubleshoot further. 🚀

PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations It is impossible to change a nullable field 'user' on booking to non-nullable without providing a default. This is because the database needs something to populate existing rows. Please select a fix: 1) Provide a one-off default now (will be set on all existing rows with a null value for this column) 2) Ignore for now. Existing rows that contain NULL values will have to be handled manually, for example with a RunPython or RunSQL operation. 3) Quit and manually define a default value in models.py. Select an option: from django.db import models from accounts.models import CustomUser class Customer(models.Model): user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True) name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) def __str__(self): return self.name class Vehicle(models.Model): customer = models.ForeignKey(Customer, on_delete=models.CASCADE) make = models.CharField(max_length=50) model = models.CharField(max_length=50) registration_number = models.CharField(max_length=20, unique=True) def __str__(self): return f"{self.make} {self.model} - {self.registration_number}" class Service(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) def __str__(self): return f"{self.name} - KSH {self.cost}" class Part(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) def __str__(self): return f"{self.name} - KSH {self.cost}" class Booking(models.Model): user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings",null=True,blank=True) vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings") service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings" ) created_at = models.DateTimeField(auto_now_add=True) # Timestamp of booking def __str__(self): return f"{self.vehicle.registration_number} - {self.service.name}" class Billing(models.Model): booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True, related_name="bookings") part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True, related_name="bookings") part_quantity = models.IntegerField(default=1) total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True) # Ensuring no NULL values payment_method = models.CharField(max_length=50) payment_amount = models.DecimalField(max_digits=10, decimal_places=2) def calculate_total(self): total = self.booking.service.cost if self.booking else 0 # Prevents crashes if booking is NULL if self.part: total += self.part.cost * self.part_quantity return total def save(self, *args, **kwargs): self.total_cost = self.calculate_total() # Ensure total cost is always set super().save(*args, **kwargs) def __str__(self): return f"Billing for {self.booking} - Total: KSH {self.total_cost}" class Invoice(models.Model): billing = models.OneToOneField(Billing, on_delete=models.CASCADE) invoice_number = models.CharField(max_length=50, unique=True, blank=True) date_created = models.DateTimeField(auto_now_add=True) total_amount = models.DecimalField(max_digits=10, decimal_places=2) payment_status = models.CharField(max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid') def __str__(self): return f"Invoice #{self.invoice_number} - {self.payment_status}" def generate_invoice_number(self): # Example logic for generating an invoice number return f"INV-{self.id}" def save(self, *args, **kwargs): if not self.invoice_number: super().save(*args, **kwargs) # Save first to get a PK self.invoice_number = self.generate_invoice_number() self.total_amount = self.billing.total_cost # Ensure total amount is copied super().save(*args, **kwargs) # Save again with invoice number

Your error message:
"It is impossible to change a nullable field 'user' on booking to non-nullable without providing a default."

💡 Why is this happening?

Your Booking model has a user field:

python
user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings", null=True, blank=True)

The null=True, blank=True allows NULL values.
But Django is now trying to remove null=True and make it required, which conflicts with existing NULL data in the database.

🛠️ How to Fix?

You have 3 options:

✅ Option 1: Choose a Default User (Recommended)

If all Bookings need a user, pick an existing CustomUser as the default.

Select Option 1 when prompted:

sql
Please select a fix:
1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
2) Ignore for now. Existing rows that contain NULL values will have to be handled manually, for example with a RunPython or RunSQL operation.
3) Quit and manually define a default value in models.py.
Select an option: 1

Enter a valid user_id (e.g., 1 if it exists in the CustomUser table).
```
cpp
Please enter the default value now, e.g., 1:
```

✅ Option 2: Keep `null=True` in Models

If some Bookings don't have a user, keep the field nullable.

Ensure this line is in Booking model:

python
user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings", null=True, blank=True)

Run Migrations Again:

bash
python manage.py makemigrations billing
python manage.py migrate billing

✅ Option 3: Manually Handle NULL Values

If you prefer, you can manually set a default for all NULL values.

Open Django shell:
```
bash
python manage.py shell
```

Assign a default user to NULL bookings:

python
from billing.models import Booking
from accounts.models import CustomUser

default_user = CustomUser.objects.first()  # Pick an existing user
Booking.objects.filter(user__isnull=True).update(user=default_user)

Re-run migrations:

bash
python manage.py makemigrations billing
python manage.py migrate billing

🚀 Final Steps

Run python manage.py runserver
Test /services/track/ page
If the error persists, send the new error log so we can debug further! 🚀

PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py runserver Watching for file changes with StatReloader Performing system checks... System check identified no issues (0 silenced). You have 4 unapplied migration(s). Your project may not work properly until you apply the migrations for app(s): billing. Run 'python manage.py migrate' to apply them. April 02, 2025 - 13:07:48 Django version 5.1.7, using settings 'garage.settings' Starting development server at http://127.0.0.1:8000/ Quit the server with CTRL-BREAK. [02/Apr/2025 13:07:58] "GET / HTTP/1.1" 200 4510 Forbidden: /accounts/customer_dashboard/ [02/Apr/2025 13:08:02] "GET /accounts/customer_dashboard/ HTTP/1.1" 403 40 [02/Apr/2025 13:08:06] "POST /accounts/logout/ HTTP/1.1" 302 0 [02/Apr/2025 13:08:06] "GET /accounts/login/ HTTP/1.1" 200 2916 [02/Apr/2025 13:08:13] "POST /accounts/login/ HTTP/1.1" 302 0 [02/Apr/2025 13:08:13] "GET /accounts/customer_dashboard/ HTTP/1.1" 200 5264 Internal Server Error: /services/track/ Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sqlite3.OperationalError: no such table: billing_booking The above exception was the direct cause of the following exception: Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py", line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py", line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\services\views.py", line 85, in track_service_progress return render(request, "services/track_service.html", {"bookings": bookings}) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\shortcuts.py", line 25, in render content = loader.render_to_string(template_name, context, request, using=using) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\loader.py", line 62, in render_to_string return template.render(context, request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\backends\django.py", line 107, in render return self.template.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py", line 171, in render return self._render(context) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py", line 163, in _render return self.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py", line 1008, in render return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py", line 969, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\loader_tags.py", line 159, in render return compiled_parent._render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py", line 163, in _render return self.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py", line 1008, in render return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py", line 969, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\loader_tags.py", line 65, in render result = block.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py", line 1008, in render return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\base.py", line 969, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\template\defaulttags.py", line 326, in render if match: ^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 414, in __bool__ self._fetch_all() File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1928, in _fetch_all self._result_cache = list(self._iterable_class(self)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 91, in __iter__ results = compiler.execute_sql( ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\compiler.py", line 1574, in execute_sql cursor.execute(sql, params) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 122, in execute return super().execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 79, in execute return self._execute_with_wrappers( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 92, in _execute_with_wrappers return executor(sql, params, many, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ with self.db.wrap_database_errors: File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ django.db.utils.OperationalError: no such table: billing_booking [02/Apr/2025 13:08:16] "GET /services/track/ HTTP/1.1" 500 197118 PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations It is impossible to change a nullable field 'user' on booking to non-nullable without providing a default. This is because the database needs something to populate existing rows. Please select a fix: 1) Provide a one-off default now (will be set on all existing rows with a null value for this column) 2) Ignore for now. Existing rows that contain NULL values will have to be handled manually, for example with a RunPython or RunSQL operation. 3) Quit and manually define a default value in models.py. Select an option: 1 Please enter the default value as valid Python. The datetime and django.utils.timezone modules are available, so it is possible to provide e.g. timezone.now as a value. Type 'exit' to exit this prompt >>> exit() PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations It is impossible to change a nullable field 'user' on booking to non-nullable without providing a default. This is because the database needs something to populate existing rows. Please select a fix: 1) Provide a one-off default now (will be set on all existing rows with a null value for this column) 2) Ignore for now. Existing rows that contain NULL values will have to be handled manually, for example with a RunPython or RunSQL operation. 3) Quit and manually define a default value in models.py. Select an option: 1 Please enter the default value as valid Python. The datetime and django.utils.timezone modules are available, so it is possible to provide e.g. timezone.now as a value. Type 'exit' to exit this prompt >>> 1 Migrations for 'billing': billing\migrations\0005_booking_user.py + Add field user to booking Migrations for 'core': core\migrations\0004_alter_booking_user.py ~ Alter field user on booking PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\manage.py", line 22, in <module> main() File "C:\Users\lau\Desktop\Projects\garage_system\manage.py", line 18, in main execute_from_command_line(sys.argv) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\__init__.py", line 442, in execute_from_command_line utility.execute() File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\__init__.py", line 436, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\base.py", line 413, in run_from_argv self.execute(*args, **cmd_options) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\base.py", line 459, in execute output = self.handle(*args, **options) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\base.py", line 107, in wrapper res = handle_func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\management\commands\migrate.py", line 121, in handle executor.loader.check_consistent_history(connection) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\migrations\loader.py", line 327, in check_consistent_history raise InconsistentMigrationHistory( django.db.migrations.exceptions.InconsistentMigrationHistory: Migration billing.0005_booking_user is applied before its dependency billing.0004_alter_invoice_invoice_number on database 'default'. PS C:\Users\lau\Desktop\Projects\garage_system>

It looks like your migration history is inconsistent, likely due to manually changing models and running migrations in a non-linear order. Here’s how to fix it:

Solution: Reset Migration History

Since this is a development environment, resetting the migrations might be the simplest way forward.

Step 1: Delete Migration Files

In your Django project, navigate to the migrations folders of the affected apps (billing and possibly core).
Delete all migration files except __init__.py.

Step 2: Reset the Database (Optional)

If you don’t have important data, you can delete your SQLite database file:

sh
rm db.sqlite3  # If using SQLite

For PostgreSQL or MySQL, you may need to drop and recreate the database.

Step 3: Recreate Migrations

Run:

sh
python manage.py makemigrations
python manage.py migrate

Alternative: Fake Migrations (If You Need Data)

If you can’t afford to delete the database, you can force Django to mark migrations as applied:

sh
python manage.py migrate --fake billing

Then, apply only the missing migrations:

sh
python manage.py migrate

Try these steps and let me know if you get stuck! 🚀

Are you adding a "Make a Payment" feature to your Garage Billing System?

Here’s what we can do:

1️⃣ Update the HTML to Link to a Payment Page

Modify your list item to point to the payment page:

html
<li class="list-group-item">
    <a href="{% url 'make_payment' %}">Make a Payment</a>
</li>

2️⃣ Create the Payment View in Django

In views.py, define a view for the payment page:

python
from django.shortcuts import render

def make_payment(request):
    return render(request, 'billing/make_payment.html')

3️⃣ Add a URL Pattern

In urls.py, add the path for payments:

python
from django.urls import path
from .views import make_payment

urlpatterns = [
    path('make-payment/', make_payment, name='make_payment'),
]

4️⃣ Create a Payment Template

Create billing/templates/billing/make_payment.html and add a simple form:

html
{% extends 'base.html' %}

{% block content %}
<h2>Make a Payment</h2>
<form method="POST">
    {% csrf_token %}
    <label for="amount">Amount (KSH):</label>
    <input type="number" name="amount" required>
    <button type="submit">Pay Now</button>
</form>
{% endblock %}

5️⃣ Handle Payment Processing (Optional)

How do you want to handle payments?

M-Pesa API (For Kenya)
Stripe/PayPal
Manual Bank Transfers

Let me know your payment method, and I'll guide you further! 🚀

import uuid from django.db import IntegrityError from django.shortcuts import render, redirect, get_object_or_404 from django.contrib.auth.decorators import login_required from django.http import HttpResponse from datetime import datetime from .models import * from .forms import * def is_admin(user): return user.is_staff or user.role == "admin" def billing_home(request): return render(request, "billing/home.html") @login_required def create_customer(request): """Creates or updates a customer profile linked to the logged-in user.""" customer, created = Customer.objects.get_or_create( user=request.user, defaults={"name": request.user.username, "email": request.user.email}, ) if request.method == "POST": form = CustomerForm(request.POST, instance=customer) if form.is_valid(): form.save() # Fetch the latest vehicle (if exists), else redirect to vehicle creation latest_vehicle = customer.vehicle_set.first() # Assuming One-to-Many (Customer → Vehicles) if latest_vehicle: return redirect("create_booking", vehicle_id=latest_vehicle.id) else: return redirect("", customer_id=customer.id) # Adjust this URL if needed else: form = CustomerForm(instance=customer) return render(request, "billing/create_customer.html", {"form": form, "customer": customer}) @login_required def create_booking(request, vehicle_id): """Allows a customer to book a service for their vehicle.""" vehicle = get_object_or_404(Vehicle, id=vehicle_id) if request.method == "POST": service_id = request.POST.get("service") selected_service = get_object_or_404(Service, id=service_id) # Create a new booking booking = Booking.objects.create( user=request.user, vehicle=vehicle, service=selected_service ) # Generate a billing entry automatically Billing.objects.create( booking=booking, total_cost=selected_service.cost, payment_method="", payment_amount=0, ) return redirect("create_billing", booking_id=booking.id) return render( request, "billing/create_booking.html", {"vehicle": vehicle, "services": Service.objects.all()}, ) @login_required def create_billing(request, booking_id): """Generates a billing record after a booking is made.""" booking = get_object_or_404(Booking, id=booking_id) # Get the booked service and other details booked_service = booking.service vehicle = booking.vehicle # Get the vehicle associated with the booking parts = Part.objects.all() print(f"Debug - Booking ID: {booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}") if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None payment_method = request.POST.get("payment_method") payment_amount = float(request.POST.get("payment_amount", 0)) # Calculate total cost total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) billing, created = Billing.objects.update_or_create( booking=booking, defaults={ "part": selected_part, "payment_method": payment_method, "payment_amount": payment_amount, "total_cost": total_cost, }, ) return redirect("generate_invoice", billing_id=billing.id) return render( request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts, }, ) def generate_invoice_number(): """Generates a unique invoice number in the format INV-YYYYMMDD-XXX.""" today = datetime.today().strftime("%Y%m%d") last_invoice = Invoice.objects.filter(invoice_number__startswith=f"INV-{today}").order_by("-invoice_number").first() new_number = (int(last_invoice.invoice_number.split("-")[-1]) + 1) if last_invoice else 1 return f"INV-{today}-{new_number:03d}" def generate_invoice(request, billing_id): # Get the Billing instance using billing_id billing = get_object_or_404(Billing, id=billing_id) # Access the associated Invoice directly invoice = billing.invoice # Access related Invoice using the 'invoice' attribute # Pass both 'invoice' and 'billing' to the template return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing}) according to the logic what do you suggest i include to slove the without using create_vehicle

Based on your current logic, it seems that you want to handle the process of booking services for a customer's vehicle without explicitly having the user create a vehicle beforehand.

You mentioned avoiding the need for create_vehicle. Here’s what I suggest to address this:

1. Automatically Create a Vehicle for the Customer (If None Exists)

If a customer doesn’t have a vehicle already, you could automatically create a placeholder or dummy vehicle for them. This way, the booking process can proceed without explicitly requiring the user to create a vehicle first.

You can integrate this step in your create_customer or create_booking view.

Solution: Auto-create a Dummy Vehicle if None Exists

In the create_booking view (which handles the vehicle selection and service booking):

Check if the customer has a vehicle.
If the customer doesn’t have one, create a default or placeholder vehicle automatically.
Redirect to the create_booking page after the vehicle is created.

Updated Logic for `create_booking`:

python
@login_required
def create_booking(request, vehicle_id=None):
    """Allows a customer to book a service for their vehicle."""
    customer = request.user.customer  # Assuming customer is related to user

    # If no vehicle_id is passed, auto-create a default vehicle if none exist
    if vehicle_id is None:
        vehicle = customer.vehicle_set.first()  # Get the first vehicle
        if not vehicle:
            vehicle = Vehicle.objects.create(customer=customer, name="Default Vehicle")
    
    else:
        vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    if request.method == "POST":
        service_id = request.POST.get("service")
        selected_service = get_object_or_404(Service, id=service_id)

        # Create a new booking
        booking = Booking.objects.create(
            user=request.user, vehicle=vehicle, service=selected_service
        )

        # Generate a billing entry automatically
        Billing.objects.create(
            booking=booking,
            total_cost=selected_service.cost,
            payment_method="",
            payment_amount=0,
        )

        return redirect("create_billing", booking_id=booking.id)

    return render(
        request,
        "billing/create_booking.html",
        {"vehicle": vehicle, "services": Service.objects.all()},
    )

Key Updates:

The create_booking view now checks if a vehicle_id is passed. If not, it tries to find the first vehicle linked to the logged-in user.
If no vehicle is found, a default vehicle will be created.
This avoids requiring the user to create a vehicle upfront.

2. Improve User Flow:

If you create a default vehicle for the customer, you can also notify them that it’s been done automatically.

In the create_booking.html, you can show the vehicle's name, letting users know which vehicle has been selected or created for them.

Optional: Customize the Dummy Vehicle

If you'd like to improve the user experience, you can give them the option to edit the vehicle details after the booking. You could show them a button like “Edit Vehicle Details” if a placeholder vehicle is created.

Would you like to add that feature, or does the auto-creation of a vehicle work for your use case?

@login_required def create_customer(request): """Creates or updates a customer profile linked to the logged-in user.""" customer, created = Customer.objects.get_or_create( user=request.user, defaults={"name": request.user.username, "email": request.user.email}, ) if request.method == "POST": form = CustomerForm(request.POST, instance=customer) if form.is_valid(): form.save() # Fetch the latest vehicle (if exists), else redirect to vehicle creation latest_vehicle = customer.vehicle_set.first() # Assuming One-to-Many (Customer → Vehicles) if latest_vehicle: return redirect("create_booking", vehicle_id=latest_vehicle.id) else: return redirect("", customer_id=customer.id) # Adjust this URL if needed else: form = CustomerForm(instance=customer) return render(request, "billing/create_customer.html", {"form": form, "customer": customer}) my logic was once you save a customer it takes you to the next page which is create booking

Your current logic for the create_customer view works well for redirecting the user to the create_booking page after saving the customer. However, if there are no vehicles associated with the customer, you are attempting to redirect them to a URL ("") that doesn't seem correct, as you are passing customer.id without a proper route defined.

You can modify the flow slightly to ensure that the user is either redirected to the booking page if they have a vehicle or to a page where they can create one if they don't.

Here’s an updated version of the code to handle both cases:

Updated `create_customer` Logic:

python
@login_required
def create_customer(request):
    """Creates or updates a customer profile linked to the logged-in user."""
    customer, created = Customer.objects.get_or_create(
        user=request.user,
        defaults={"name": request.user.username, "email": request.user.email},
    )

    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            form.save()

            # Fetch the latest vehicle (if exists)
            latest_vehicle = customer.vehicle_set.first()  # Assuming One-to-Many (Customer → Vehicles)
            if latest_vehicle:
                return redirect("create_booking", vehicle_id=latest_vehicle.id)
            else:
                # If no vehicle exists, create one automatically or redirect to vehicle creation page
                vehicle = Vehicle.objects.create(customer=customer, name="Default Vehicle")
                return redirect("create_booking", vehicle_id=vehicle.id)

    else:
        form = CustomerForm(instance=customer)

    return render(request, "billing/create_customer.html", {"form": form, "customer": customer})

Changes:

After the customer profile is saved, we check if they have any associated vehicles (latest_vehicle = customer.vehicle_set.first()).
If a vehicle exists, we redirect them to the create_booking page, passing the vehicle_id as a parameter.
If no vehicle exists, instead of leaving them on an undefined URL, we create a default vehicle (Vehicle.objects.create) and redirect them to the booking page with the newly created vehicle.

Alternative (if you want a dedicated vehicle creation page):

If you want to create a more refined user flow, you can also redirect to a dedicated page where the customer can create a vehicle manually, instead of auto-generating one.

For that, you'd replace the else block with a redirection to a specific URL for vehicle creation:

python
else:
    return redirect("create_vehicle")  # Adjust this route to match the URL for vehicle creation

This gives users the flexibility to enter more specific details about their vehicle if necessary.

Let me know if you need further clarification or if you'd like help with another aspect!

To solve the issue, it seems like after the customer books a service for their vehicle, you want to ensure that all relevant information about the vehicle is passed along and can be used for subsequent steps, like generating a billing record and invoice.

From what you've mentioned, I understand that the vehicle details need to be used after the booking is made. Here's how we can adjust your logic to properly handle the vehicle information in the booking and ensure it is accessible for later actions (like billing).

1. Ensure the Vehicle is Passed Correctly in the Booking

When a customer creates a booking, you need to ensure that the vehicle information is correctly associated with the booking. You might also want to ensure that the vehicle is not only linked to the booking but also used when generating the billing details.

2. Review Your Current Booking Flow

The key part is how you're handling the vehicle details during booking creation (create_booking). Let’s update this function to ensure vehicle data is handled properly.

Here’s a more refined version of the create_booking view that includes the vehicle information:

Updated `create_booking` Logic:

python
@login_required
def create_booking(request, vehicle_id):
    """Allows a customer to book a service for their vehicle."""
    # Ensure the vehicle exists and is associated with the logged-in customer
    vehicle = get_object_or_404(Vehicle, id=vehicle_id, customer__user=request.user)

    if request.method == "POST":
        service_id = request.POST.get("service")
        selected_service = get_object_or_404(Service, id=service_id)

        # Create a new booking with the selected service for the vehicle
        booking = Booking.objects.create(
            user=request.user,
            vehicle=vehicle,  # Ensure the vehicle is correctly associated
            service=selected_service
        )

        # Generate a billing entry automatically based on the selected service and the vehicle
        Billing.objects.create(
            booking=booking,
            total_cost=selected_service.cost,
            payment_method="",
            payment_amount=0,
        )

        # Redirect to the create_billing page with the new booking ID
        return redirect("create_billing", booking_id=booking.id)

    return render(
        request,
        "billing/create_booking.html",
        {
            "vehicle": vehicle,
            "services": Service.objects.all(),
            "vehicle_info": vehicle,  # Include vehicle info in the context for display
        },
    )

Explanation of the Key Changes:

Ensure Vehicle Association: We make sure that the vehicle_id passed to the view corresponds to a vehicle that belongs to the logged-in customer (customer__user=request.user).
Use Vehicle in the Booking: When creating the Booking instance, the vehicle is passed, linking the booking to that specific vehicle.
Pass Vehicle Info to Template: The vehicle_info context is passed to the template so you can display the vehicle details on the booking page.

3. Update `create_billing` to Include Vehicle Information:

The create_billing function can also be updated to include vehicle details. You already have the booking and vehicle associated with the billing, but it’s important to ensure the vehicle data is displayed in the billing page too.

Updated `create_billing` Logic:

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    # Get the Booking instance using booking_id
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the associated service and vehicle
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking

    # Get all available parts for the customer to choose from
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate the total cost based on service and selected parts
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create or update the billing record
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Redirect to generate the invoice
        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,  # Pass vehicle details for billing page
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Key Points:

Vehicle Association in Billing: The vehicle information is passed along to the billing page, ensuring that the customer and vehicle details are displayed during the billing process.
Calculation of Total Cost: You are calculating the total_cost by adding the cost of the service and the selected parts, ensuring the final billing is correct.

4. Template Adjustments:

Finally, ensure that you update your templates (create_booking.html and create_billing.html) to display the relevant vehicle details.

Example for displaying vehicle information in the booking template:

html
<h3>Vehicle Details</h3>
<p>Make: {{ vehicle.make }}</p>
<p>Model: {{ vehicle.model }}</p>
<p>Year: {{ vehicle.year }}</p>
<!-- You can include any other vehicle details as needed -->

In the billing page template, you can similarly display vehicle-related information.

By following these steps, you ensure that after a booking is created, the vehicle data is consistently passed along and available for both billing and invoice generation. Let me know if this solution works or if you need further clarification!

The overall structure of your views looks solid, but I will walk through some areas where you might need to make adjustments or improvements to ensure everything works as expected.

Key Areas to Check and Adjust:

create_customer View:
- Current logic: You're getting or creating the Customer model, then checking if the form is valid. After saving the form, you're checking if the customer has a vehicle and either redirecting to the booking page or a new vehicle creation page.
- Possible issue: You should ensure that the vehicle creation process is handled properly. Currently, if the customer doesn't have any vehicle, it redirects to an empty URL (redirect("", customer_id=customer.id)). It may be better to create a specific view for adding vehicles or handle it in a different way.
Suggested adjustment:
- Ensure that the redirect for creating a vehicle is correct. You could direct them to a specific view for vehicle creation if needed.
```
python
if latest_vehicle:
    return redirect("create_booking", vehicle_id=latest_vehicle.id)
else:
    return redirect("create_vehicle", customer_id=customer.id)  # Adjust to a view that creates a vehicle
```
create_booking View:
- Current logic: You're fetching the vehicle based on the vehicle_id, then allowing the user to select a service, create a booking, and generate a billing entry.
- Possible issue: You're directly creating a Booking and Billing entry without checking if the service exists or if the selected_service cost is valid.
- Improvement: Add validation for when the service ID is invalid or if the selected_service doesn't exist.
Suggested adjustment:
- Make sure you handle cases where no service is selected or if the service is invalid.
```
python
if service_id:
    selected_service = get_object_or_404(Service, id=service_id)
else:
    # Handle error case, maybe redirect back or show an error message
    return HttpResponse("Service not selected", status=400)
```
create_billing View:
- Current logic: You're fetching the Booking object, the associated vehicle and service, and then allowing the user to select parts for the billing. After calculating the total cost, you're creating or updating the Billing entry.
- Possible issue: The selected_part might be None (if no part is selected). Ensure the total cost calculation handles this gracefully.
- Improvement: Add validation for selected_part, ensuring it's either valid or None without causing issues.
Suggested adjustment:
- Ensure that the cost calculations handle the case where no part is selected.
```
python
if part_id:
    selected_part = Part.objects.get(id=part_id)
    part_cost = selected_part.cost
else:
    selected_part = None
    part_cost = 0  # If no part is selected, no cost should be added

total_cost = booked_service.cost + part_cost
```
generate_invoice View:
- Current logic: You're fetching the Billing object and directly accessing the associated Invoice using the invoice attribute.
- Possible issue: Ensure that the Invoice object is properly related to the Billing model and that the invoice attribute exists for the Billing instance.
- Improvement: You can add an extra check to ensure that the invoice exists.
Suggested adjustment:
- Handle cases where the Invoice might not exist.
```
python
if not billing.invoice:
    # Handle case where no invoice exists (you can redirect to an error page or generate one)
    return HttpResponse("Invoice not found", status=404)
```

Full Updated Code with Adjustments:

python
@login_required
def create_customer(request):
    """Creates or updates a customer profile linked to the logged-in user."""
    customer, created = Customer.objects.get_or_create(
        user=request.user,
        defaults={"name": request.user.username, "email": request.user.email},
    )

    if request.method == "POST":
        form = CustomerForm(request.POST, instance=customer)
        if form.is_valid():
            form.save()

            # Fetch the latest vehicle (if exists), else redirect to vehicle creation
            latest_vehicle = customer.vehicle_set.first()  # Assuming One-to-Many (Customer → Vehicles)
            if latest_vehicle:
                return redirect("create_booking", vehicle_id=latest_vehicle.id)
            else:
                return redirect("create_vehicle", customer_id=customer.id)  # Redirect to create vehicle

    else:
        form = CustomerForm(instance=customer)

    return render(request, "billing/create_customer.html", {"form": form, "customer": customer})


@login_required
def create_booking(request, vehicle_id):
    """Allows a customer to book a service for their vehicle."""
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    if request.method == "POST":
        service_id = request.POST.get("service")
        if service_id:
            selected_service = get_object_or_404(Service, id=service_id)
        else:
            return HttpResponse("Service not selected", status=400)  # Handle invalid service selection

        # Create a new booking
        booking = Booking.objects.create(
            user=request.user, vehicle=vehicle, service=selected_service
        )

        # Generate a billing entry automatically
        Billing.objects.create(
            booking=booking,
            total_cost=selected_service.cost,
            payment_method="",
            payment_amount=0,
        )

        return redirect("create_billing", booking_id=booking.id)

    return render(
        request,
        "billing/create_booking.html",
        {"vehicle": vehicle, "services": Service.objects.all()},
    )


@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    print(f"Debug - Booking ID: {booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        if part_id:
            selected_part = Part.objects.get(id=part_id)
            part_cost = selected_part.cost
        else:
            selected_part = None
            part_cost = 0  # If no part is selected, no cost should be added

        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + part_cost

        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {"vehicle": vehicle, "booked_service": booked_service, "parts": parts},
    )


def generate_invoice(request, billing_id):
    # Get the Billing instance using billing_id
    billing = get_object_or_404(Billing, id=billing_id)
    
    # Ensure that the Invoice exists
    if not billing.invoice:
        return HttpResponse("Invoice not found", status=404)

    invoice = billing.invoice  # Access related Invoice using the 'invoice' attribute

    # Pass both 'invoice' and 'billing' to the template
    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Summary of Adjustments:

Customer View: Redirect to a vehicle creation page if no vehicle exists.
Booking View: Handle invalid service selection gracefully.
Billing View: Ensure the cost calculation handles the case where no part is selected.
Invoice View: Ensure the invoice exists before proceeding.

These changes should ensure a more robust flow for creating customers, bookings, billing, and invoices while also adding better error handling.

Let me know if you'd like further improvements or have additional questions!

To create the create_vehicle logic, we need to design a view that allows the user to add a vehicle after the customer profile is created or when no vehicles exist for the customer. This should include capturing vehicle details such as make, model, year, and any other relevant information.

Steps to Create the `create_vehicle` View:

Create the Form: First, you need to create a form to capture the vehicle details. This form will be associated with the Vehicle model.
Create the View: In this view, if the form is valid, the vehicle will be added to the customer profile and saved in the database.
Redirect to the Booking Page: After a successful vehicle creation, redirect the user to the booking page.

Form for Vehicle Creation:

In the forms.py, create a form to handle the vehicle data:

python
from django import forms
from .models import Vehicle

class VehicleForm(forms.ModelForm):
    class Meta:
        model = Vehicle
        fields = ['make', 'model', 'year', 'registration_number']

View for Creating Vehicle:

Now, create the create_vehicle view that will allow the user to add a vehicle.

python
@login_required
def create_vehicle(request, customer_id):
    """Allows a customer to add a vehicle to their profile."""
    customer = get_object_or_404(Customer, id=customer_id, user=request.user)

    if request.method == "POST":
        form = VehicleForm(request.POST)
        if form.is_valid():
            vehicle = form.save(commit=False)
            vehicle.customer = customer  # Associate the vehicle with the customer
            vehicle.save()

            # Redirect to the create_booking page with the newly added vehicle
            return redirect("create_booking", vehicle_id=vehicle.id)
    else:
        form = VehicleForm()

    return render(request, "billing/create_vehicle.html", {"form": form, "customer": customer})

Explanation:

Customer Lookup:
- We fetch the Customer object by customer_id and ensure it belongs to the logged-in user.
Form Handling:
- If the form is submitted via POST, we save the vehicle object linked to the customer using commit=False to associate the customer with the vehicle before saving.
Redirect:
- After successfully creating the vehicle, the user is redirected to the create_booking page for that specific vehicle.
Form:
- If the form is not yet submitted, we render the create_vehicle.html page with the vehicle form.

Template for Vehicle Creation:

Now, you need a template where the user can fill in the vehicle details. Here's a simple template:

html
<!-- create_vehicle.html -->
{% extends "base.html" %}

{% block content %}
  <h2>Add a Vehicle</h2>
  <form method="POST">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit" class="btn btn-primary">Save Vehicle</button>
  </form>
{% endblock %}

URLs Configuration:

Don't forget to add a URL route for the create_vehicle view in your urls.py.

python
from django.urls import path
from . import views

urlpatterns = [
    path('create_customer/', views.create_customer, name='create_customer'),
    path('create_vehicle/<int:customer_id>/', views.create_vehicle, name='create_vehicle'),
    # other URL patterns...
]

Flow Overview:

Customer Creation: If the customer doesn’t have a vehicle, they will be redirected to the create_vehicle page.
Vehicle Creation: The user enters vehicle details.
Booking: After creating the vehicle, the user is redirected to book a service for that vehicle.

With these adjustments, the create_vehicle logic should now work seamlessly, allowing customers to add vehicles and proceed to book services.

works but import uuid from django.db import IntegrityError from django.shortcuts import render, redirect, get_object_or_404 from django.contrib.auth.decorators import login_required from django.http import HttpResponse from datetime import datetime from .models import * from .forms import * def is_admin(user): return user.is_staff or user.role == "admin" def billing_home(request): return render(request, "billing/home.html") @login_required def create_customer(request): """Creates or updates a customer profile linked to the logged-in user.""" customer, created = Customer.objects.get_or_create( user=request.user, defaults={"name": request.user.username, "email": request.user.email}, ) if request.method == "POST": form = CustomerForm(request.POST, instance=customer) if form.is_valid(): form.save() # Fetch the latest vehicle (if exists), else redirect to vehicle creation latest_vehicle = customer.vehicle_set.first() # Assuming One-to-Many (Customer → Vehicles) if latest_vehicle: return redirect("create_booking", vehicle_id=latest_vehicle.id) else: return redirect("create_vehicle", customer_id=customer.id) # Adjust this URL if needed else: form = CustomerForm(instance=customer) return render(request, "billing/create_customer.html", {"form": form, "customer": customer}) @login_required def create_vehicle(request, customer_id): """Allows a customer to add a vehicle to their profile.""" customer = get_object_or_404(Customer, id=customer_id, user=request.user) if request.method == "POST": form = VehicleForm(request.POST) if form.is_valid(): vehicle = form.save(commit=False) vehicle.customer = customer # Associate the vehicle with the customer vehicle.save() # Redirect to the create_booking page with the newly added vehicle return redirect("create_booking", vehicle_id=vehicle.id) else: form = VehicleForm() return render(request, "billing/create_vehicle.html", {"form": form, "customer": customer}) @login_required def create_booking(request, vehicle_id): """Allows a customer to book a service for their vehicle.""" vehicle = get_object_or_404(Vehicle, id=vehicle_id) if request.method == "POST": service_id = request.POST.get("service") selected_service = get_object_or_404(Service, id=service_id) # Create a new booking booking = Booking.objects.create( user=request.user, vehicle=vehicle, service=selected_service ) # Generate a billing entry automatically Billing.objects.create( booking=booking, total_cost=selected_service.cost, payment_method="", payment_amount=0, ) return redirect("create_billing", booking_id=booking.id) return render( request, "billing/create_booking.html", {"vehicle": vehicle, "services": Service.objects.all()}, ) @login_required def create_billing(request, booking_id): """Generates a billing record after a booking is made.""" booking = get_object_or_404(Booking, id=booking_id) # Get the booked service and other details booked_service = booking.service vehicle = booking.vehicle # Get the vehicle associated with the booking parts = Part.objects.all() print(f"Debug - Booking ID: {booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}") if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None payment_method = request.POST.get("payment_method") payment_amount = float(request.POST.get("payment_amount", 0)) # Calculate total cost total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) billing, created = Billing.objects.update_or_create( booking=booking, defaults={ "part": selected_part, "payment_method": payment_method, "payment_amount": payment_amount, "total_cost": total_cost, }, ) return redirect("generate_invoice", billing_id=billing.id) return render( request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts, }, ) def generate_invoice_number(): """Generates a unique invoice number in the format INV-YYYYMMDD-XXX.""" today = datetime.today().strftime("%Y%m%d") last_invoice = Invoice.objects.filter(invoice_number__startswith=f"INV-{today}").order_by("-invoice_number").first() new_number = (int(last_invoice.invoice_number.split("-")[-1]) + 1) if last_invoice else 1 return f"INV-{today}-{new_number:03d}" def generate_invoice(request, billing_id): # Get the Billing instance using billing_id billing = get_object_or_404(Billing, id=billing_id) # Access the associated Invoice directly invoice = billing.invoice # Access related Invoice using the 'invoice' attribute # Pass both 'invoice' and 'billing' to the template return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing}) create_booking is not working in that the details i had to select are no longer available

It seems that the issue arises when the user is redirected to the create_booking page after creating a vehicle, but the vehicle details are not being passed correctly or available for service selection. The issue likely comes from the create_booking view not properly handling the data flow.

Here's a step-by-step way to ensure everything works correctly:

Diagnosis:

Cause: When you're redirected to create_booking, the service selection (service_id) for the vehicle is not available because the context is not set properly.
Solution: Ensure that after creating the vehicle and redirecting, the correct vehicle and associated services are passed to the create_booking view.

Solution:

Confirm Vehicle Availability: Ensure that after the customer creates a vehicle, the vehicle is properly passed and available when the create_booking page is rendered.
Booking Logic: In the create_booking view, we should make sure that the vehicle is being passed properly, and that the Service objects (or related data) are also made available.

Adjustments:

Here’s how you can modify your create_booking view:

`create_booking` View:

Make sure that the view handles the vehicle object properly and passes the required data to the template:

python
@login_required
def create_booking(request, vehicle_id):
    """Allows a customer to book a service for their vehicle."""
    vehicle = get_object_or_404(Vehicle, id=vehicle_id)

    # Check if the user owns the vehicle, ensuring security
    if vehicle.customer.user != request.user:
        return HttpResponse("You do not have permission to book services for this vehicle.", status=403)

    if request.method == "POST":
        service_id = request.POST.get("service")
        selected_service = get_object_or_404(Service, id=service_id)

        # Create a new booking
        booking = Booking.objects.create(
            user=request.user, vehicle=vehicle, service=selected_service
        )

        # Generate a billing entry automatically
        Billing.objects.create(
            booking=booking,
            total_cost=selected_service.cost,
            payment_method="",
            payment_amount=0,
        )

        return redirect("create_billing", booking_id=booking.id)

    # Pass the vehicle and list of services to the template
    return render(
        request,
        "billing/create_booking.html",
        {"vehicle": vehicle, "services": Service.objects.all()},
    )

Explanation:

Security Check: Ensure that only the user who owns the vehicle can book services for it (if vehicle.customer.user != request.user).
Service Selection: When the POST request is made, the selected_service is obtained by the service_id, which is expected from the form input.

Template for `create_booking.html`:

Here’s a simple template to allow the customer to select a service for the vehicle:

html
<!-- create_booking.html -->
{% extends "base.html" %}

{% block content %}
  <h2>Book a Service for {{ vehicle }}</h2>

  <form method="POST">
    {% csrf_token %}
    <label for="service">Select Service:</label>
    <select name="service" id="service">
      {% for service in services %}
        <option value="{{ service.id }}">{{ service.name }} - KSH {{ service.cost }}</option>
      {% endfor %}
    </select>

    <button type="submit" class="btn btn-primary">Book Service</button>
  </form>
{% endblock %}

Flow:

Create Customer: User fills in customer details.
Create Vehicle: After customer creation, they are redirected to the vehicle creation form if no vehicle exists.
Create Booking: After a vehicle is created, the customer can select the service they want and book it. The available services are fetched dynamically and displayed.

Conclusion:

With these adjustments, you should now be able to:

Ensure that when creating a vehicle, the user can select a service for the vehicle immediately after.
Ensure that the create_booking view properly loads the available services for the selected vehicle.
Handle edge cases such as ensuring that only the user associated with the vehicle can make bookings for it.

Let me know if you encounter any issues!

RelatedObjectDoesNotExist at /billing/generate_invoice/1/ Billing has no invoice. Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/1/ Django Version: 5.1.7 Exception Type: RelatedObjectDoesNotExist Exception Value: Billing has no invoice. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\fields\related_descriptors.py, line 531, in __get__ Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Wed, 02 Apr 2025 11:09:12 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 156, in generate_invoice invoice = billing.invoice # Access related Invoice using the 'invoice' attribute ^^^^^^^^^^^^^^^

The error you're encountering is a RelatedObjectDoesNotExist exception. This occurs because you're trying to access the related Invoice object for a Billing instance, but the Billing instance doesn't have an associated Invoice. This happens when the invoice field (or related object) has not been created or linked to the Billing instance yet.

Problem:

In the generate_invoice view, you're trying to access the invoice related object of Billing:

python
invoice = billing.invoice  # Access related Invoice using the 'invoice' attribute

However, the Billing object doesn't have an Invoice object linked to it, which causes the RelatedObjectDoesNotExist exception.

Solutions:

Check if the Billing instance has an associated Invoice before trying to access it. If no invoice exists, you can handle the case gracefully.
Ensure that an Invoice is created when a Billing instance is created. This might be part of your workflow, and you should ensure that the Billing object has an Invoice related to it before trying to access it in the generate_invoice view.

Option 1: Add a Check for Existence

Update your generate_invoice view to check if the Billing instance has an Invoice before trying to access it. Here's an example:

python
@login_required
def generate_invoice(request, billing_id):
    # Get the Billing instance using billing_id
    billing = get_object_or_404(Billing, id=billing_id)

    # Check if the Billing instance has an associated Invoice
    if not billing.invoice:
        # Handle the case where no invoice exists (e.g., create one or return an error)
        return HttpResponse("No invoice found for this billing record.", status=404)

    # Access the associated Invoice directly
    invoice = billing.invoice  # Access related Invoice using the 'invoice' attribute

    # Pass both 'invoice' and 'billing' to the template
    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Option 2: Ensure Invoice Creation

If your logic is that every Billing instance should have an associated Invoice, make sure that the Invoice is created when you create the Billing instance. For example, when creating the Billing record in the create_billing view, you can create the Invoice as well:

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    print(f"Debug - Booking ID: {booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create or update the Billing object
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Ensure an Invoice is created for the Billing (if it doesn't already exist)
        if not billing.invoice:
            invoice_number = generate_invoice_number()
            invoice = Invoice.objects.create(
                billing=billing,
                invoice_number=invoice_number,
                issue_date=datetime.today(),
            )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

What’s Changed:

Option 1: Adds a check in the generate_invoice view to handle cases where the Billing instance doesn't have an associated Invoice. This ensures that if the Invoice is missing, a user-friendly message is displayed.
Option 2: Ensures that every Billing instance has an associated Invoice by creating it when necessary.

Conclusion:

You can choose either approach based on your application's requirements:

If you want to handle cases where the Invoice is missing, go with Option 1.
If you want to ensure that an Invoice is always created when a Billing is made, go with Option 2.

Let me know which approach you'd like to implement, or if you need further assistance!

def generate_invoice_number(): """Generates a unique invoice number in the format INV-YYYYMMDD-XXX.""" today = datetime.today().strftime("%Y%m%d") last_invoice = Invoice.objects.filter(invoice_number__startswith=f"INV-{today}").order_by("-invoice_number").first() new_number = (int(last_invoice.invoice_number.split("-")[-1]) + 1) if last_invoice else 1 return f"INV-{today}-{new_number:03d}" def generate_invoice(request, billing_id): # Get the Billing instance using billing_id billing = get_object_or_404(Billing, id=billing_id) # Access the associated Invoice directly invoice = billing.invoice # Access related Invoice using the 'invoice' attribute # Pass both 'invoice' and 'billing' to the template return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

The generate_invoice_number() function is correctly designed to create a unique invoice number based on the current date and incrementing a sequence number if there are multiple invoices created on the same day. However, in the generate_invoice() view, you're encountering an issue where the Billing instance does not have an associated Invoice object, leading to the RelatedObjectDoesNotExist exception.

Here’s a breakdown of what needs to be fixed:

Ensure that an Invoice is created when a Billing instance is created: The key problem is that you're assuming there will always be an Invoice related to the Billing instance, but it’s not guaranteed unless you explicitly create the Invoice after the Billing instance is saved. This can be handled by ensuring the Invoice is created automatically after a Billing instance is created.
Fix generate_invoice_number(): The generate_invoice_number() function already seems to work well. It checks if an invoice number exists for the current day and increments the number accordingly. However, we need to ensure that when we create the Billing object, it always has an Invoice.

Updated Flow:

When a Billing is created, an Invoice is also created (if it does not already exist).
The generate_invoice() view will only be called after the Billing and its related Invoice are both present.

Adjustments to the `create_billing()` view:

In this updated version, an Invoice is generated automatically after creating or updating the Billing instance.

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    print(f"Debug - Booking ID: {booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create or update the Billing object
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Ensure an Invoice is created for the Billing (if it doesn't already exist)
        if not billing.invoice:
            invoice_number = generate_invoice_number()
            invoice = Invoice.objects.create(
                billing=billing,
                invoice_number=invoice_number,
                issue_date=datetime.today(),
            )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Changes Made:

Invoice Creation: After the Billing object is created or updated, the code checks whether an Invoice already exists for the Billing. If not, it creates a new Invoice with a generated number.
Redirection to Generate Invoice: After the Invoice is created (if it didn't already exist), the user is redirected to the generate_invoice page where the invoice and billing details are rendered.

The `generate_invoice()` View:

You can keep the generate_invoice() view as you have it, with the assumption that an Invoice will now always exist for a Billing instance:

python
@login_required
def generate_invoice(request, billing_id):
    # Get the Billing instance using billing_id
    billing = get_object_or_404(Billing, id=billing_id)
    
    # Access the associated Invoice directly
    invoice = billing.invoice  # Access related Invoice using the 'invoice' attribute

    # Pass both 'invoice' and 'billing' to the template
    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

What Happens Now:

The create_billing() view ensures that every Billing instance will have an associated Invoice.
When you go to generate_invoice/1/ (or any billing_id), the invoice will always be present, preventing the RelatedObjectDoesNotExist error.

Let me know if you'd like to further tweak or add anything!

billing>models.py from django.db import models from accounts.models import CustomUser class Customer(models.Model): user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True) name = models.CharField(max_length=100) email = models.EmailField() phone = models.CharField(max_length=15) def __str__(self): return self.name class Vehicle(models.Model): customer = models.ForeignKey(Customer, on_delete=models.CASCADE) make = models.CharField(max_length=50) model = models.CharField(max_length=50) registration_number = models.CharField(max_length=20, unique=True) def __str__(self): return f"{self.make} {self.model} - {self.registration_number}" class Service(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) def __str__(self): return f"{self.name} - KSH {self.cost}" class Part(models.Model): name = models.CharField(max_length=100) cost = models.DecimalField(max_digits=10, decimal_places=2) def __str__(self): return f"{self.name} - KSH {self.cost}" class Booking(models.Model): user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, related_name="customer_bookings",null=True,blank=True) vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings") service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings" ) created_at = models.DateTimeField(auto_now_add=True) # Timestamp of booking def __str__(self): return f"{self.vehicle.registration_number} - {self.service.name}" class Billing(models.Model): booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True, related_name="bookings") part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True, related_name="bookings") part_quantity = models.IntegerField(default=1) total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True) # Ensuring no NULL values payment_method = models.CharField(max_length=50) payment_amount = models.DecimalField(max_digits=10, decimal_places=2) def calculate_total(self): total = self.booking.service.cost if self.booking else 0 # Prevents crashes if booking is NULL if self.part: total += self.part.cost * self.part_quantity return total def save(self, *args, **kwargs): self.total_cost = self.calculate_total() # Ensure total cost is always set super().save(*args, **kwargs) def __str__(self): return f"Billing for {self.booking} - Total: KSH {self.total_cost}" class Invoice(models.Model): billing = models.OneToOneField(Billing, on_delete=models.CASCADE) invoice_number = models.CharField(max_length=50, unique=True, blank=True) date_created = models.DateTimeField(auto_now_add=True) total_amount = models.DecimalField(max_digits=10, decimal_places=2) payment_status = models.CharField(max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid') def __str__(self): return f"Invoice #{self.invoice_number} - {self.payment_status}" def generate_invoice_number(self): # Example logic for generating an invoice number return f"INV-{self.id}" def save(self, *args, **kwargs): if not self.invoice_number: super().save(*args, **kwargs) # Save first to get a PK self.invoice_number = self.generate_invoice_number() self.total_amount = self.billing.total_cost # Ensure total amount is copied super().save(*args, **kwargs) # Save again with invoice number def generate_invoice(request, billing_id): # Get the Billing instance using billing_id billing = get_object_or_404(Billing, id=billing_id) # Access the associated Invoice directly invoice = billing.invoice # Access related Invoice using the 'invoice' attribute # Pass both 'invoice' and 'billing' to the template return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing}) RelatedObjectDoesNotExist at /billing/generate_invoice/1/ Billing has no invoice. RelatedObjectDoesNotExist at /billing/generate_invoice/1/ Billing has no invoice.

The issue you're facing with RelatedObjectDoesNotExist: Billing has no invoice is due to the fact that the Invoice instance is not automatically created when a Billing is created. The Billing instance may exist without an associated Invoice until explicitly created, which causes the error when trying to access billing.invoice.

To fix this, you need to ensure that when a Billing is created, an associated Invoice is also created automatically. You can do this by adding the logic to create the Invoice in the save() method of the Billing model or in the view after the Billing instance is created.

Solution:

Create an Invoice When a Billing is Created: After creating the Billing, check if it has an associated Invoice. If it does not, create one.

Update the `create_billing` view:

In the create_billing() view, after creating the Billing instance, ensure that an Invoice is created for the Billing if it doesn't already exist.

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    print(f"Debug - Booking ID: {booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create or update the Billing object
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Ensure an Invoice is created for the Billing (if it doesn't already exist)
        if not billing.invoice:
            invoice_number = generate_invoice_number()
            invoice = Invoice.objects.create(
                billing=billing,
                invoice_number=invoice_number,
                date_created=datetime.today(),
                total_amount=billing.total_cost,  # Use the total cost from Billing
            )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Why this works:

Invoice Creation: When a Billing is created or updated, we ensure that an Invoice is also created for it if no invoice exists. This ensures that the billing.invoice relationship is always set when you try to access it.
Redirection to the Invoice Page: After the Billing and Invoice are created, the user is redirected to the invoice generation page where both the Billing and the associated Invoice are passed to the template.

The `generate_invoice()` view remains the same:

Since the Invoice is guaranteed to exist after the create_billing() view is executed, you can keep the generate_invoice() view as you had it:

python
@login_required
def generate_invoice(request, billing_id):
    # Get the Billing instance using billing_id
    billing = get_object_or_404(Billing, id=billing_id)
    
    # Access the associated Invoice directly
    invoice = billing.invoice  # Access related Invoice using the 'invoice' attribute

    # Pass both 'invoice' and 'billing' to the template
    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Further Suggestions:

Ensure that the Invoice model is correctly related: The Invoice should always have a Billing associated with it, and it's essential that the save() method in Invoice properly handles the creation of the invoice_number and total_amount when saving.
Validate the Billing and Invoice relationship: If you want to enforce the creation of an Invoice whenever a Billing is saved, you can use the post_save signal in Django to automatically create the Invoice after saving the Billing instance. Let me know if you'd prefer to implement it using signals.

This should solve the error you're encountering, as the Invoice will always be available after creating a Billing. Let me know if you need more help!

Internal Server Error: /billing/generate_invoice/1/ Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py", line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py", line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\billing\views.py", line 168, in generate_invoice invoice = billing.invoice # Access related Invoice using the 'invoice' attribute ^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\fields\related_descriptors.py", line 531, in __get__ raise self.RelatedObjectDoesNotExist( billing.models.Billing.invoice.RelatedObjectDoesNotExist: Billing has no invoice. [02/Apr/ class Invoice(models.Model): billing = models.OneToOneField(Billing, on_delete=models.CASCADE) invoice_number = models.CharField(max_length=50, unique=True, blank=True) date_created = models.DateTimeField(auto_now_add=True) total_amount = models.DecimalField(max_digits=10, decimal_places=2) payment_status = models.CharField(max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid') def __str__(self): return f"Invoice #{self.invoice_number} - {self.payment_status}" def generate_invoice_number(self): # Example logic for generating an invoice number return f"INV-{self.id}" def save(self, *args, **kwargs): if not self.invoice_number: super().save(*args, **kwargs) # Save first to get a PK self.invoice_number = self.generate_invoice_number() self.total_amount = self.billing.total_cost # Ensure total amount is copied super().save(*args, **kwargs) # Save again with invoice number

The error RelatedObjectDoesNotExist: Billing has no invoice indicates that there is no Invoice associated with the Billing instance when trying to access billing.invoice. This could happen if the Invoice wasn't created properly or if there was an issue with the saving process.

Possible causes:

Invoice not created properly: When the Billing instance is created, an Invoice should be created afterward, but it seems that the creation of the Invoice might not be working as expected.
Save order issue: In the Invoice.save() method, you first save the Invoice object to generate a primary key, and then set the invoice_number based on that primary key. This is fine, but the Billing instance must already be fully saved before you attempt to create the Invoice.

Solutions:

Option 1: Check for Invoice Creation in the View

In your view, after creating or updating the Billing instance, you need to ensure that an Invoice is created if it doesn’t exist.

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    print(f"Debug - Booking ID: {booking.id}, Service: {booked_service.name} - KSH {booked_service.cost}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create or update the Billing object
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Ensure an Invoice is created for the Billing (if it doesn't already exist)
        if not billing.invoice:  # Check if an Invoice exists for this Billing
            invoice_number = generate_invoice_number()
            invoice = Invoice.objects.create(
                billing=billing,
                invoice_number=invoice_number,
                date_created=datetime.today(),
                total_amount=billing.total_cost,  # Use the total cost from Billing
            )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Option 2: Using `post_save` Signal to Automatically Create the Invoice

Another approach is to use Django signals to automatically create the Invoice when a Billing instance is saved. This will eliminate the need to manually create the Invoice in your view.

In models.py, you can add a signal to create the Invoice automatically whenever a Billing instance is created:

python
from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=Billing)
def create_invoice_for_billing(sender, instance, created, **kwargs):
    if created:  # Only create invoice when a new Billing is created
        invoice_number = generate_invoice_number()
        Invoice.objects.create(
            billing=instance,
            invoice_number=invoice_number,
            total_amount=instance.total_cost,
            date_created=datetime.today()
        )

Make sure to import the receiver decorator and the post_save signal at the top of your models.py.

Explanation:

Option 1 (View-level Invoice Creation): This ensures that an Invoice is explicitly created when a Billing is created. If no Invoice exists for a Billing, it is created in the create_billing view after the Billing instance is saved.
Option 2 (Signal-based Invoice Creation): The signal automatically creates an Invoice whenever a new Billing instance is created. This is a more automatic approach and offloads the logic from the view to the model layer, ensuring that the Invoice is created every time a Billing is saved.

Both approaches should solve the RelatedObjectDoesNotExist issue. You can choose either based on your preference for view-based or signal-based handling of related objects.

Let me know if you need further assistance!

The error you're encountering occurs because billing.invoice is being accessed, but no related Invoice exists for that Billing object. This means that, despite your Invoice model being properly set up to be related to Billing, there's no Invoice instance tied to the Billing instance at the moment you're trying to access it.

Fixing the Issue

There are two main ways to handle this situation:

Check if an Invoice exists before accessing it: You can modify the view to check whether an Invoice exists for the Billing instance before trying to access it.
Ensure that an Invoice is created when a Billing is created: Either use a view-based solution to create the Invoice when the Billing is saved or leverage Django signals to automate the creation of the Invoice.

Let’s walk through both approaches:

Approach 1: Check for `Invoice` Existence in the View

You can modify the generate_invoice view to check if an Invoice exists for the given Billing before trying to access it.

python
@login_required
def generate_invoice(request, billing_id):
    # Get the Billing instance using billing_id
    billing = get_object_or_404(Billing, id=billing_id)
    
    # Check if an Invoice exists for this Billing
    if not billing.invoice:
        # If no invoice exists, you can either create one or return an error
        return HttpResponse("Invoice not found. Please create an invoice first.", status=400)

    # Access the associated Invoice
    invoice = billing.invoice  # Access related Invoice using the 'invoice' attribute

    # Pass both 'invoice' and 'billing' to the template
    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

In this approach, if no Invoice exists, you’ll get a message indicating that the invoice needs to be created.

Approach 2: Ensure `Invoice` Creation When `Billing` Is Created

You can use Django signals to automatically create an Invoice for a Billing when it is created. This avoids the need to manually check for an Invoice in the view.

Option 2.1: Using Django Signals

You can use the post_save signal to create an Invoice automatically when a Billing instance is saved.

Here’s how to do it:

Add a signal that creates an Invoice after a Billing is saved. This should go in your models.py.

python
from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=Billing)
def create_invoice_for_billing(sender, instance, created, **kwargs):
    if created:  # Only create invoice when a new Billing is created
        invoice_number = generate_invoice_number()  # Use the logic from your existing method
        Invoice.objects.create(
            billing=instance,
            invoice_number=invoice_number,
            total_amount=instance.total_cost,
            date_created=datetime.today()
        )

Don't forget to connect the signal at the top of your models.py (near the imports):

python
from django.db.models.signals import post_save
from django.dispatch import receiver

Ensure that the signal is correctly firing. After a Billing instance is saved, this signal will create an associated Invoice.

Option 2.2: Manually Create Invoice in the View

If you prefer manually creating the Invoice in your view, you can ensure that the Invoice is created after a Billing is saved by updating your view:

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create or update the Billing object
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Ensure an Invoice is created for the Billing if it doesn't already exist
        if not billing.invoice:  # Check if Invoice exists
            invoice_number = generate_invoice_number()
            Invoice.objects.create(
                billing=billing,
                invoice_number=invoice_number,
                total_amount=billing.total_cost,
                date_created=datetime.today()
            )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Explanation:

Approach 1: This simply checks if the Invoice exists before trying to access it. If it doesn't exist, the view will return an error response.
Approach 2: This ensures that an Invoice is automatically created for every Billing when a new Billing instance is saved. This eliminates the need to worry about missing Invoice objects in your views.

Let me know which approach you'd prefer or if you need further assistance!

It seems like you are missing the corresponding database migrations or the migrations have not been applied yet for the models in your Django project. Here's what you can do to resolve the issue:

Steps to Resolve Missing Models in the Database

Create Migrations for the Models: After adding or modifying models in your models.py, you need to generate migrations. You can do this by running the following command:
```
bash
python manage.py makemigrations
```
This command will create migration files for any changes made to your models.
Apply Migrations to the Database: After generating the migrations, you need to apply them to the database. Run the following command:
```
bash
python manage.py migrate
```
This will apply the migrations to the database and create the necessary tables for your models.
Check the Database Schema: After running the migrations, check your database (via Django’s database shell or any database management tool like pgAdmin or DB Browser for SQLite) to ensure that the tables corresponding to your models (Customer, Vehicle, Service, Part, Booking, Billing, and Invoice) are created.
Ensure ForeignKey Relationships are Correct: If your models have ForeignKey fields, ensure that the related models are correctly set up. For example, in the Billing model, the booking and part fields reference other models. Make sure those models (Booking and Part) are properly migrated as well.

Additional Tips

Run a Check: After migrating, you can run the following command to check if there are any issues with your migrations:
```
bash
python manage.py check
```

Test with a New Instance: After applying the migrations, test by creating a new Billing and Invoice instance through the Django admin interface or via the Django shell:

bash
python manage.py shell

Then you can manually create a new Billing and Invoice:

python
from billing.models import Billing, Invoice
from accounts.models import CustomUser
from vehicle.models import Vehicle, Service

# Create a test customer
user = CustomUser.objects.create(username="test_user", password="password")
customer = Customer.objects.create(user=user, name="Test Customer", email="test@example.com", phone="1234567890")

# Create a vehicle
vehicle = Vehicle.objects.create(customer=customer, make="Toyota", model="Corolla", registration_number="ABC123")

# Create a service
service = Service.objects.create(name="Oil Change", cost=500)

# Create a booking
booking = Booking.objects.create(user=user, vehicle=vehicle, service=service)

# Create a billing instance
billing = Billing.objects.create(booking=booking, part=None, payment_method="Cash", payment_amount=500)

# Create an invoice
invoice = Invoice.objects.create(billing=billing, total_amount=500, payment_status="Unpaid")

This will help ensure that the models are working as expected.

Let me know if you encounter any issues during these steps!

System check identified no issues (0 silenced). April 02, 2025 - 14:25:07 Django version 5.1.7, using settings 'garage.settings' Starting development server at http://127.0.0.1:8000/ Quit the server with CTRL-BREAK. [02/Apr/2025 14:25:11] "GET /billing/create_booking/2/ HTTP/1.1" 200 2721 [02/Apr/2025 14:25:14] "GET /billing/create_billing/2/ HTTP/1.1" 200 2111 Internal Server Error: /billing/create_billing/2/ Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py", line 55, in inner ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py", line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\auth\decorators.py", line 60, in _view_wrapper return view_func(request, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\billing\views.py", line 125, in create_billing if not billing.invoice: # Check if Invoice exists ^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\fields\related_descriptors.py", line 531, in __get__ raise self.RelatedObjectDoesNotExist( billing.models.Billing.invoice.RelatedObjectDoesNotExist: Billing has no invoice. [02/Apr/2025 14:25:22] "POST /billing/create_billing/2/ HTTP/1.1" 500 79561 [02/Apr/2025 14:27:47] "GET /admin/billing/ HTTP/1.1" 200 7625 PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations No changes detected PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: No migrations to apply. PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from billing.models import Billing, Invoice >>> from accounts.models import CustomUser >>> from vehicle.models import Vehicle, Service Traceback (most recent call last): File "<console>", line 1, in <module> ModuleNotFoundError: No module named 'vehicle' >>> >>> # Create a test customer >>> user = CustomUser.objects.create(username="test_user", password="password") >>> customer = Customer.objects.create(user=user, name="Test Customer", email="test@example.com", phone="1234567890") Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Customer' is not defined. Did you mean: 'CustomUser'? >>> >>> # Create a vehicle >>> vehicle = Vehicle.objects.create(customer=customer, make="Toyota", model="Corolla", registration_number="ABC123") Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Vehicle' is not defined >>> >>> # Create a service >>> service = Service.objects.create(name="Oil Change", cost=500) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Service' is not defined >>> >>> # Create a booking >>> booking = Booking.objects.create(user=user, vehicle=vehicle, service=service) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Booking' is not defined >>> >>> # Create a billing instance >>> billing = Billing.objects.create(booking=booking, part=None, payment_method="Cash", payment_amount=500) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'booking' is not defined >>> >>> # Create an invoice >>> invoice = Invoice.objects.create(billing=billing, total_amount=500, payment_status="Unpaid") Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'billing' is not defined. Did you mean: 'Billing'? >>>

It seems like you're encountering multiple issues while testing your code. Let's address them step by step:

1. Error in `views.py` - Billing has no invoice

The error you're encountering is because you're trying to access the invoice of a Billing instance, but the related Invoice object doesn't exist yet.

In the create_billing view, before you attempt to check if not billing.invoice, you need to ensure that the Invoice is created for that Billing instance.

Fix:

You need to check if the Invoice for the Billing instance exists. If it doesn't, you should create one. Here's an updated version of your view:

python
def create_billing(request, booking_id):
    # Assuming you've already fetched the Billing instance
    billing = Billing.objects.get(id=booking_id)
    
    # Check if an invoice already exists, if not create one
    if not hasattr(billing, 'invoice'):
        invoice = Invoice.objects.create(billing=billing, total_amount=billing.total_cost, payment_status="Unpaid")
    else:
        invoice = billing.invoice  # Invoice already exists

    # Your additional logic goes here
    
    return render(request, "billing/billing_detail.html", {"billing": billing, "invoice": invoice})

In this code, hasattr(billing, 'invoice') checks whether the invoice exists for the billing instance. If it doesn't exist, an Invoice is created for that Billing.

2. Testing in Django Shell - NameError for Undefined Models

It seems you encountered NameError when you tried to create objects in the Django shell. This error occurs because you did not import the necessary models before attempting to use them.

Here's the correct way to import and test in the Django shell:

python
# Import the necessary models first
from billing.models import Billing, Invoice, Customer, Vehicle, Service, Booking
from accounts.models import CustomUser

# Create a test customer
user = CustomUser.objects.create(username="test_user", password="password")
customer = Customer.objects.create(user=user, name="Test Customer", email="test@example.com", phone="1234567890")

# Create a vehicle
vehicle = Vehicle.objects.create(customer=customer, make="Toyota", model="Corolla", registration_number="ABC123")

# Create a service
service = Service.objects.create(name="Oil Change", cost=500)

# Create a booking
booking = Booking.objects.create(user=user, vehicle=vehicle, service=service)

# Create a billing instance
billing = Billing.objects.create(booking=booking, part=None, payment_method="Cash", payment_amount=500)

# Create an invoice
invoice = Invoice.objects.create(billing=billing, total_amount=500, payment_status="Unpaid")

This should solve the NameError issue, as all the necessary models will be imported before you use them.

3. Additional Notes:

Ensure models are registered: Sometimes when testing in Django shell, ensure that the models are properly imported by checking the app's models.py file and confirming the correct model names.
Database migration: Double-check that all migrations are applied correctly, as you have already done with makemigrations and migrate. You should be able to see the Billing, Invoice, and related models in your database schema.

Let me know if you run into any further issues!

S C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: No migrations to apply. PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py shell Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from billing.models import Billing, Invoice >>> from accounts.models import CustomUser >>> from vehicle.models import Vehicle, Service Traceback (most recent call last): File "<console>", line 1, in <module> ModuleNotFoundError: No module named 'vehicle' >>> >>> # Create a test customer >>> user = CustomUser.objects.create(username="test_user", password="password") >>> customer = Customer.objects.create(user=user, name="Test Customer", email="test@example.com", phone="1234567890") Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Customer' is not defined. Did you mean: 'CustomUser'? >>> >>> # Create a vehicle >>> vehicle = Vehicle.objects.create(customer=customer, make="Toyota", model="Corolla", registration_number="ABC123") Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Vehicle' is not defined >>> >>> # Create a service >>> service = Service.objects.create(name="Oil Change", cost=500) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Service' is not defined >>> >>> # Create a booking >>> booking = Booking.objects.create(user=user, vehicle=vehicle, service=service) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Booking' is not defined >>> >>> # Create a billing instance >>> billing = Billing.objects.create(booking=booking, part=None, payment_method="Cash", payment_amount=500) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'booking' is not defined >>> >>> # Create an invoice >>> invoice = Invoice.objects.create(billing=billing, total_amount=500, payment_status="Unpaid") Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'billing' is not defined. Did you mean: 'Billing'? >>> # Import the necessary models first >>> from billing.models import Billing, Invoice, Customer, Vehicle, Service, Booking >>> from accounts.models import CustomUser >>> >>> # Create a test customer >>> user = CustomUser.objects.create(username="test_user", password="password") Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sqlite3.IntegrityError: UNIQUE constraint failed: accounts_customuser.username The above exception was the direct cause of the following exception: Traceback (most recent call last): File "<console>", line 1, in <module> File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 679, in create obj.save(force_insert=True, using=self.db) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\auth\base_user.py", line 62, in save super().save(*args, **kwargs) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 892, in save self.save_base( File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 998, in save_base updated = self._save_table( ^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 1161, in _save_table results = self._do_insert( ^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 1202, in _do_insert return manager._insert( ^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1847, in _insert return query.get_compiler(using=using).execute_sql(returning_fields) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\compiler.py", line 1836, in execute_sql cursor.execute(sql, params) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 122, in execute return super().execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 79, in execute return self._execute_with_wrappers( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 92, in _execute_with_wrappers return executor(sql, params, many, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 100, in _execute with self.db.wrap_database_errors: File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ django.db.utils.IntegrityError: UNIQUE constraint failed: accounts_customuser.username >>> customer = Customer.objects.create(user=user, name="Test Customer", email="test@example.com", phone="1234567890") >>> >>> # Create a vehicle >>> vehicle = Vehicle.objects.create(customer=customer, make="Toyota", model="Corolla", registration_number="ABC123") >>> >>> # Create a service >>> service = Service.objects.create(name="Oil Change", cost=500) >>> >>> # Create a booking >>> booking = Booking.objects.create(user=user, vehicle=vehicle, service=service) >>> >>> # Create a billing instance >>> billing = Billing.objects.create(booking=booking, part=None, payment_method="Cash", payment_amount=500) >>> >>> # Create an invoice >>> invoice = Invoice.objects.create(billing=billing, total_amount=500, payment_status="Unpaid") Traceback (most recent call last): File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sqlite3.IntegrityError: UNIQUE constraint failed: billing_invoice.id The above exception was the direct cause of the following exception: Traceback (most recent call last): File "<console>", line 1, in <module> File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 679, in create obj.save(force_insert=True, using=self.db) File "C:\Users\lau\Desktop\Projects\garage_system\billing\models.py", line 85, in save super().save(*args, **kwargs) # Save again with invoice number ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 892, in save self.save_base( File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 998, in save_base updated = self._save_table( ^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 1161, in _save_table results = self._do_insert( ^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\base.py", line 1202, in _do_insert return manager._insert( ^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\query.py", line 1847, in _insert return query.get_compiler(using=using).execute_sql(returning_fields) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\sql\compiler.py", line 1836, in execute_sql cursor.execute(sql, params) File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 122, in execute return super().execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 79, in execute return self._execute_with_wrappers( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 92, in _execute_with_wrappers return executor(sql, params, many, context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 100, in _execute with self.db.wrap_database_errors: File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\utils.py", line 105, in _execute return self.cursor.execute(sql, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\backends\sqlite3\base.py", line 354, in execute return super().execute(query, params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ django.db.utils.IntegrityError: UNIQUE constraint failed: billing_invoice.id >>>

It looks like you're encountering issues related to the database constraints in your Django project. Specifically:

UNIQUE constraint failed: accounts_customuser.username – This error indicates that the username you're trying to create already exists in the database. If you're testing in the Django shell and trying to create a new user, make sure the username is unique, or clear the existing records from the CustomUser table if appropriate for testing purposes.
UNIQUE constraint failed: billing_invoice.id – This error occurs when you're trying to insert a record with a duplicate id in the billing_invoice table, which should be unique. It looks like you might be trying to save an invoice with the same ID as an existing record. You can either adjust the save logic or manually clear any existing invoices that might be causing conflicts.

To resolve these:

Steps to fix:

For the CustomUser unique constraint error:
- Check if a user with the username "test_user" already exists. If it does, either delete it or use a unique username like "test_user_2".
- You can clear the database for testing by running the following:
```
bash
python manage.py flush
```
For the billing_invoice unique constraint error:
- It seems that the Invoice model might be generating a duplicate ID. Double-check the logic in the save() method or ensure you're not manually setting the id field when creating the record.
- You can also try clearing the existing records in the billing_invoice table or use a different invoice ID.
- If you're creating invoices programmatically, you can remove or adjust the auto-generated fields to prevent conflicts.

Let me know if you need more specific steps or assistance debugging these errors!

Running flush will clear your database and reset it to its initial state, which will erase all existing data. If you're okay with that (for example, if this is a development environment and you want to start fresh), type yes to proceed. Otherwise, type no to cancel and avoid losing any data.

If you want to clear just the specific problematic records (like the duplicate user or invoice), I can guide you through other methods to do that without flushing the entire database. Let me know how you'd like to proceed!

To clear the specific problematic records like the duplicate user or invoice, here are some steps you can follow to remove them manually:

1. Delete the Duplicate User:

It looks like the CustomUser with the username "test_user" already exists, causing a conflict. You can delete the user and recreate it.

Open the Django shell:
```
bash
python manage.py shell
```

Delete the duplicate user:

python
from accounts.models import CustomUser
CustomUser.objects.filter(username="test_user").delete()

This will remove the existing "test_user".

2. Delete the Duplicate Invoice:

If the issue lies with the Invoice model, you can remove the conflicting records.

In the Django shell, delete the problematic invoice:

python
from billing.models import Invoice
Invoice.objects.filter(id=<duplicate_invoice_id>).delete()

Replace <duplicate_invoice_id> with the actual ID of the invoice causing the conflict.

3. Fix the Integrity Issue:

If you are still facing the UNIQUE constraint failed error after removing duplicates, it might be due to an issue with the auto-increment primary key for the Invoice model. You can try resetting the primary key sequence:
```
python
from django.db import connection
with connection.cursor() as cursor:
    cursor.execute("DELETE FROM billing_invoice;")
    cursor.execute("DELETE FROM django_migrations WHERE app='billing';")
```

4. Re-create the Records:

Once the duplicates are removed, you can proceed with re-creating the test customer, vehicle, service, booking, billing, and invoice:

python
from accounts.models import CustomUser
from billing.models import Customer, Vehicle, Service, Booking, Billing, Invoice

# Create a test user
user = CustomUser.objects.create(username="test_user", password="password")

# Create a test customer
customer = Customer.objects.create(user=user, name="Test Customer", email="test@example.com", phone="1234567890")

# Create a vehicle
vehicle = Vehicle.objects.create(customer=customer, make="Toyota", model="Corolla", registration_number="ABC123")

# Create a service
service = Service.objects.create(name="Oil Change", cost=500)

# Create a booking
booking = Booking.objects.create(user=user, vehicle=vehicle, service=service)

# Create a billing instance
billing = Billing.objects.create(booking=booking, part=None, payment_method="Cash", payment_amount=500)

# Create an invoice
invoice = Invoice.objects.create(billing=billing, total_amount=500, payment_status="Unpaid")

Let me know if you'd like me to walk you through any of these steps, or if you encounter any issues!

It seems like you forgot to replace <duplicate_invoice_id> with the actual invoice ID number when trying to delete the invoice. Here’s how you can fix it:

Step 1: Check for Existing Invoices

You can check for the invoices that exist in the database by running:

python
from billing.models import Invoice
Invoice.objects.all()

This will return all the invoices. Look at the ID field and identify the duplicate or problematic invoice.

Step 2: Delete the Duplicate Invoice

Once you identify the problematic invoice ID, you can delete it by using the correct ID number. For example, if the duplicate invoice ID is 1, you would do:

python
Invoice.objects.filter(id=1).delete()

Replace 1 with the correct ID of the invoice you want to delete.

Let me know if you need further assistance!

It looks like there are no invoices in the database at the moment. If you're still encountering the UNIQUE constraint failed: billing_invoice.id error, it might indicate an issue in how the Invoice model is being created or some leftover records that haven't been cleared properly.

Here’s what we can do next:

Check the Migrations: Make sure that the migrations for the Invoice model have been applied correctly. You can run the following command to verify and apply any pending migrations:
```
bash
python manage.py makemigrations
python manage.py migrate
```
Check for Other Constraints: If you're still facing the issue, try inspecting your Invoice model for any unique constraints or auto-generated fields that might be conflicting.
Clear the Database Again (Optional): If you're still encountering issues and want to start fresh, you can use flush again, but this time double-check that the database has been properly reset:
```
bash
python manage.py flush
```

Let me know if any of these steps help or if you need further guidance!

Your model definitions seem good overall, but I would recommend a few improvements and clarifications to ensure they work smoothly, especially with handling the Invoice model and related fields. Here are some suggestions:

1. Ensure `Invoice` Model Handles `billing` Properly:

In the Invoice model, you're using a OneToOneField to link to the Billing model, but you may want to handle cases where the associated Billing object is deleted or modified more explicitly.

You might want to set on_delete=models.CASCADE for the billing field, but also ensure that the Invoice can't be created if there’s no related Billing.

2. Generate Invoice Number:

The generate_invoice_number method generates an invoice number using the id, which depends on the instance being saved to the database. The save method works, but you should call super().save(*args, **kwargs) first to ensure the instance is saved before you can assign an ID.

However, the logic for generating an invoice number may need a little improvement because when self.id is None, it could create issues. It might be better to generate the invoice number once the object is saved and has an ID.

Suggested Adjustments:

python
from django.db import models
from accounts.models import CustomUser

class Customer(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE, null=True, blank=True)
    name = models.CharField(max_length=100)
    email = models.EmailField()
    phone = models.CharField(max_length=15)

    def __str__(self):
        return self.name

class Vehicle(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    make = models.CharField(max_length=50)
    model = models.CharField(max_length=50)
    registration_number = models.CharField(max_length=20, unique=True)

    def __str__(self):
        return f"{self.make} {self.model} - {self.registration_number}"

class Service(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

class Part(models.Model):
    name = models.CharField(max_length=100)
    cost = models.DecimalField(max_digits=10, decimal_places=2)

    def __str__(self):
        return f"{self.name} - KSH {self.cost}"

class Booking(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE,  related_name="customer_bookings",null=True,blank=True)
    vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE, related_name="bookings")
    service = models.ForeignKey(Service, on_delete=models.CASCADE, related_name="bookings" )
    created_at = models.DateTimeField(auto_now_add=True)  # Timestamp of booking

    def __str__(self):
        return f"{self.vehicle.registration_number} - {self.service.name}"

class Billing(models.Model):
    booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True, related_name="bookings")
    part = models.ForeignKey(Part, on_delete=models.SET_NULL, null=True, blank=True, related_name="bookings")
    part_quantity = models.IntegerField(default=1)
    total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)  # Ensuring no NULL values
    payment_method = models.CharField(max_length=50)
    payment_amount = models.DecimalField(max_digits=10, decimal_places=2)

    def calculate_total(self):
        total = self.booking.service.cost if self.booking else 0  # Prevents crashes if booking is NULL
        if self.part:
            total += self.part.cost * self.part_quantity
        return total

    def save(self, *args, **kwargs):
        self.total_cost = self.calculate_total()  # Ensure total cost is always set
        super().save(*args, **kwargs)

    def __str__(self):
        return f"Billing for {self.booking} - Total: KSH {self.total_cost}"
    
class Invoice(models.Model):
    billing = models.OneToOneField(Billing, on_delete=models.CASCADE)
    invoice_number = models.CharField(max_length=50, unique=True, blank=True)
    date_created = models.DateTimeField(auto_now_add=True)
    total_amount = models.DecimalField(max_digits=10, decimal_places=2)
    payment_status = models.CharField(max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid')

    def __str__(self):
        return f"Invoice #{self.invoice_number} - {self.payment_status}"

    def generate_invoice_number(self):
        # Example logic for generating an invoice number
        return f"INV-{self.id}"

    def save(self, *args, **kwargs):
        if not self.invoice_number:
            # Save first to get a PK
            super().save(*args, **kwargs)
            # After saving, the instance gets an ID
            self.invoice_number = self.generate_invoice_number()

        # Ensure total amount is copied from billing
        self.total_amount = self.billing.total_cost
        super().save(*args, **kwargs)  # Save again with the invoice number

Explanation:

Unique Constraints on Registration Number and Invoice Number: Your Vehicle and Invoice models have unique constraints for registration_number and invoice_number. This will ensure that each registration and invoice is unique across the system.
generate_invoice_number Function: This function generates the invoice number after the object has been saved and assigned an ID. The invoice number is based on the id of the instance.
Handling of Billing and Invoice Total Amount: The Invoice saves the total_amount by getting the value from the related Billing. The calculation happens each time an invoice is created or updated.
ForeignKey Deletion Logic: In case a Billing instance is deleted, Invoice will be automatically deleted as well, due to the on_delete=models.CASCADE behavior.

If you have any other concerns or want further clarification, feel free to ask!

PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py makemigrations Migrations for 'billing': billing\migrations\0001_initial.py + Create model Part + Create model Service + Create model Booking + Create model Billing + Create model Customer + Create model Invoice + Create model Vehicle + Add field vehicle to booking PS C:\Users\lau\Desktop\Projects\garage_system> python manage.py migrate Operations to perform: Apply all migrations: accounts, admin, auth, billing, contenttypes, core, insurance, sessions Running migrations: No migrations to apply. PS C:\Users\lau\Desktop\Projects\garage_system>

It looks like the migrations have been successfully created and applied without any issues, as there are no pending migrations to apply. Your models are now up to date in the database.

You can proceed with adding data to the models or testing the functionality to ensure everything is working as expected. If you encounter any issues or need further assistance with your project, feel free to ask!

To verify if the migration was successful, you can check a few things:

Check the Database Tables: Use the Django shell or an external database tool (like DB Browser for SQLite, or any other DB viewer) to confirm that the tables corresponding to the models you created (like Customer, Vehicle, Service, Booking, Billing, and Invoice) exist in the database.

You can also check through the Django shell like this:
```
bash
python manage.py dbshell
```
Then run:
```
sql
.tables  # Lists all tables in the database
```

Check the Models in the Django Shell: You can confirm that the models are available and able to interact with the database by querying them in the Django shell:

bash
python manage.py shell

Then try to query the models like:

python
from billing.models import Customer, Vehicle, Service, Booking, Billing, Invoice

# Check if data exists in these tables
print(Customer.objects.all())
print(Vehicle.objects.all())
print(Service.objects.all())
print(Booking.objects.all())
print(Billing.objects.all())
print(Invoice.objects.all())

If these return empty querysets or relevant data without errors, the migration was likely successful.

Run makemigrations and migrate Again: Just to confirm everything is in sync, you can re-run the following commands:
```
bash
python manage.py makemigrations
python manage.py migrate
```
If no changes are pending, it confirms that the migrations have already been applied successfully.

Let me know if you'd like to proceed with any of these checks!

To use the default Django admin to check if the migration was successful and interact with your models, you need to ensure that the Django admin is properly set up.

Here's how to proceed:

1. Make sure your models are registered in the admin:

You need to register your models (such as Customer, Vehicle, Service, Booking, Billing, and Invoice) in the admin.py file of your billing app so that they appear in the admin interface.

In billing/admin.py, add the following:

python
from django.contrib import admin
from .models import Customer, Vehicle, Service, Booking, Billing, Invoice

# Register your models here
admin.site.register(Customer)
admin.site.register(Vehicle)
admin.site.register(Service)
admin.site.register(Booking)
admin.site.register(Billing)
admin.site.register(Invoice)

2. Create a superuser (if you haven’t already):

If you haven't created a superuser yet, you'll need to do that to log in to the Django admin panel. Run the following command:

bash
python manage.py createsuperuser

Follow the prompts to create the superuser.

3. Start the development server:

Once you've registered your models and created a superuser, run the following to start the development server:

bash
python manage.py runserver

4. Access the Django Admin:

Once the server is running, go to the following URL in your browser:

arduino
http://127.0.0.1:8000/admin/

5. Check the models in the admin panel:

After logging in, you should see your registered models (Customer, Vehicle, Service, Booking, Billing, Invoice) listed in the admin panel. You can interact with the data (add, edit, delete) directly from the admin interface.

Let me know if you encounter any issues!

RelatedObjectDoesNotExist at /billing/create_billing/2/ Billing has no invoice. Request Method: POST Request URL: http://127.0.0.1:8000/billing/create_billing/2/ Django Version: 5.1.7 Exception Type: RelatedObjectDoesNotExist Exception Value: Billing has no invoice. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\fields\related_descriptors.py, line 531, in __get__ Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe @login_required def create_billing(request, booking_id): """Generates a billing record after a booking is made.""" booking = get_object_or_404(Booking, id=booking_id) # Get the booked service and other details booked_service = booking.service vehicle = booking.vehicle # Get the vehicle associated with the booking parts = Part.objects.all() if request.method == "POST": part_id = request.POST.get("part") selected_part = Part.objects.get(id=part_id) if part_id else None payment_method = request.POST.get("payment_method") payment_amount = float(request.POST.get("payment_amount", 0)) # Calculate total cost total_cost = booked_service.cost + (selected_part.cost if selected_part else 0) # Create or update the Billing object billing, created = Billing.objects.update_or_create( booking=booking, defaults={ "part": selected_part, "payment_method": payment_method, "payment_amount": payment_amount, "total_cost": total_cost, }, ) # Ensure an Invoice is created for the Billing if it doesn't already exist if not billing.invoice: # Check if Invoice exists invoice_number = generate_invoice_number() Invoice.objects.create( billing=billing, invoice_number=invoice_number, total_amount=billing.total_cost, date_created=datetime.today() ) return redirect("generate_invoice", billing_id=billing.id) return render( request, "billing/create_billing.html", { "vehicle": vehicle, "booked_service": booked_service, "parts": parts, }, )

The error you're encountering, RelatedObjectDoesNotExist: Billing has no invoice, occurs because Django is trying to access the related Invoice for a Billing object, but it doesn't exist. This typically happens when the Billing object has not been associated with an Invoice yet.

Your view logic appears to handle the creation of the Invoice correctly, but the error suggests that the check if not billing.invoice: is failing. This could happen if the related Invoice object has not been properly saved or linked.

Steps to fix the issue:

Ensure Invoice is created and saved properly:

In your create_billing view, you are trying to create an Invoice if one doesn't already exist, but the error suggests that there might be an issue with how the invoice is being linked or created. Here's an improved approach:

Instead of using if not billing.invoice:, you could explicitly check if the invoice is None and only create it when necessary.
Ensure the billing object is saved correctly and that the invoice is properly linked.

Suggested code update:

python
from django.utils import timezone  # For getting the current time

@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create or update the Billing object
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Ensure an Invoice is created for the Billing if it doesn't already exist
        if billing.invoice is None:  # Ensure the invoice is actually None
            invoice_number = f"INV-{billing.id}"  # Generate invoice number
            Invoice.objects.create(
                billing=billing,
                invoice_number=invoice_number,
                total_amount=billing.total_cost,
                date_created=timezone.now()  # Use timezone.now() for current time
            )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Changes made:

Fixed the if not billing.invoice: condition:
- I changed it to if billing.invoice is None: to explicitly check if the invoice relationship is None. This ensures you're creating an Invoice only if it doesn't exist.
Timezone for date creation:
- I replaced datetime.today() with timezone.now(). timezone.now() is preferred in Django for dealing with time, as it accounts for timezone settings in the project.
Invoice number generation:
- I added a simple invoice_number generation logic (INV-{billing.id}), but you can adjust this as per your requirement.

Additional Check:

If you expect an Invoice to exist after a Billing object is created, you might want to ensure that the Billing object creation logic works correctly and saves the Billing object before trying to access the related Invoice.

After making these changes, try running the view again to see if the error is resolved. Let me know how it goes!

RelatedObjectDoesNotExist at /billing/create_billing/2/ Billing has no invoice. Request Method: POST Request URL: http://127.0.0.1:8000/billing/create_billing/2/ Django Version: 5.1.7 Exception Type: RelatedObjectDoesNotExist Exception Value: Billing has no invoice. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\fields\related_descriptors.py, line 531, in __get__ Raised during: billing.views.create_billing Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Wed, 02 Apr 2025 11:54:55 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\contrib\auth\decorators.py, line 60, in _view_wrapper return view_func(request, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 128, in create_billing if billing.invoice is None: # Ensure the invoice is actually None ^^^^^^^^^^^^^^^

The error you're encountering, RelatedObjectDoesNotExist: Billing has no invoice, occurs when Django tries to access the invoice related object for a Billing object, but no related Invoice exists. This is likely happening because Django is trying to access the invoice object before it has been created, even though you are checking for its existence in your view.

Why the issue occurs:

In Django, when you use a OneToOneField (such as billing.invoice), it behaves like a reverse relation and is lazy-loaded. If the Billing object hasn't been linked to an Invoice yet, trying to access billing.invoice will trigger a query, which causes the RelatedObjectDoesNotExist exception if no related object exists.

Solution:

Instead of accessing billing.invoice directly within the view, you should explicitly create and save the Invoice object and then associate it properly.

Here's how you can refactor your view to ensure the Invoice is correctly created and associated with the Billing object:

python
from django.utils import timezone  # For getting the current time

@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create or update the Billing object
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Create and associate an Invoice if it doesn't already exist
        if billing.invoice is None:
            invoice_number = f"INV-{billing.id}"  # Generate invoice number
            invoice = Invoice.objects.create(
                billing=billing,
                invoice_number=invoice_number,
                total_amount=billing.total_cost,
                date_created=timezone.now(),  # Use timezone.now() for current time
            )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Key Adjustments:

Checking for the invoice existence properly:
- The line if billing.invoice is None: checks explicitly if the invoice relation is None. This prevents the RelatedObjectDoesNotExist exception from being raised.
Explicitly creating the Invoice object:
- If the Billing object doesn't have an Invoice associated with it, an Invoice is created using Invoice.objects.create(), and the relationship is established right away.
Ensuring proper saving and associating:
- The invoice is created and associated immediately after Billing is created/updated.

Next Steps:

Try this updated code, and let me know if it resolves the error. If you still encounter any issues, I can assist with further debugging.

To debug the issue and understand why the error persists, we can add logging and print statements to trace the flow of the code and gather insights about what's happening during execution. Here are some steps you can follow to debug the issue:

1. Add Debugging Logs:

You can add print statements or use Django's built-in logging framework to capture relevant details at each step of the function. This will allow you to monitor what’s happening and where the code might be failing.

Updated View with Debugging:

python
import logging
from django.utils import timezone

# Set up logging for debugging
logger = logging.getLogger(__name__)

@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    logger.debug(f"Creating billing for booking ID: {booking_id}")
    booking = get_object_or_404(Booking, id=booking_id)

    # Get the booked service and other details
    booked_service = booking.service
    vehicle = booking.vehicle  # Get the vehicle associated with the booking
    parts = Part.objects.all()

    logger.debug(f"Booking found: {booking}, Vehicle: {vehicle.registration_number}, Service: {booked_service.name}")

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)
        logger.debug(f"Total cost calculated: {total_cost}, Payment amount: {payment_amount}")

        # Create or update the Billing object
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Log billing creation or update
        logger.debug(f"Billing {'created' if created else 'updated'}: {billing.id}, Total cost: {billing.total_cost}")

        # Create and associate an Invoice if it doesn't already exist
        if billing.invoice is None:
            logger.debug(f"Creating an invoice for billing ID: {billing.id}")
            invoice_number = f"INV-{billing.id}"  # Generate invoice number
            invoice = Invoice.objects.create(
                billing=billing,
                invoice_number=invoice_number,
                total_amount=billing.total_cost,
                date_created=timezone.now(),  # Use timezone.now() for current time
            )
            logger.debug(f"Invoice created: {invoice.invoice_number}")

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

Key Debugging Additions:

Logger Setup: We added a logger (logger = logging.getLogger(__name__)) for debugging purposes.
Log Statements: We added log statements before critical operations like retrieving the booking, calculating total costs, creating/updating the billing, and creating the invoice.

2. Check Django Settings for Logging:

Ensure logging is enabled in your settings.py to capture logs. Here's an example of how to set up logging in Django:

python
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['console'],
            'level': 'DEBUG',
            'propagate': True,
        },
        '__name__': {  # This is for your custom logger
            'handlers': ['console'],
            'level': 'DEBUG',
            'propagate': True,
        },
    },
}

This configuration will print all the debug logs in the console, which will help you trace the flow and see where things are going wrong.

3. Manual Debugging with the Shell:

You can also use the Django shell to simulate the operations manually. Here’s what you can do:

Manually retrieve the Billing object and check its invoice relationship.
Create a new Invoice manually and see if the invoice relationship gets updated.

To access the shell:

bash
python manage.py shell

Then, run these commands to manually test:

python
from billing.models import Billing, Invoice

# Retrieve the billing object
billing = Billing.objects.get(id=2)

# Check if it already has an invoice
print(billing.invoice)

# Create an invoice manually
invoice = Invoice.objects.create(
    billing=billing,
    invoice_number="INV-12345",
    total_amount=billing.total_cost,
    date_created=timezone.now(),
)

# Check the updated billing object
print(billing.invoice)

This will help you understand whether the invoice is being created and associated properly.

4. Check the Database:

Sometimes the problem could be with how the data is stored in the database. You can use the Django shell or an external database tool (like SQLite browser or pgAdmin for PostgreSQL) to check the database for consistency. For example, check if the Invoice table has any records that are correctly linked to the Billing table.

bash
# Check if there are invoices linked to billings
python manage.py dbshell
# Or use an external DB tool to query the database directly
SELECT * FROM billing_invoice WHERE billing_id = 2;

5. Check for Any Foreign Key Integrity Issues:

Ensure there are no integrity issues in the foreign key relationships. If the Billing object has no invoice and invoice creation is failing, it might be worth checking if any database-level constraints are preventing this operation.

Summary:

By adding logging and using the Django shell, you should be able to see where the issue occurs and get more details about why the Invoice is not being created or associated with the Billing object.

Let me know if you need more help with debugging or interpreting the logs!

RelatedObjectDoesNotExist at /billing/generate_invoice/5/ Billing has no invoice. Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/5/ Django Version: 5.1.7 Exception Type: RelatedObjectDoesNotExist Exception Value: Billing has no invoice. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\fields\related_descriptors.py, line 531, in __get__ Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Wed, 02 Apr 2025 12:19:20 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 156, in generate_invoice invoice = billing.invoice # Access related Invoice using the 'invoice' attribute ^^^^^^^^^^^^^^^ … Local vars Variable Value billing <Billing: Billing for KAM 403S - Oil Change - Total: KSH 6500.00> billing_id 5 request <WSGIRequest: GET '/billing/generate_invoice/5/'> RelatedObjectDoesNotExist at /billing/generate_invoice/5/ Billing has no invoice. Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/5/ Django Version: 5.1.7 Exception Type: RelatedObjectDoesNotExist Exception Value: Billing has no invoice. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\fields\related_descriptors.py, line 531, in __get__ Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Wed, 02 Apr 2025 12:19:20 +0000 Traceback Switch to copy-and-paste view C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\exception.py, line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\core\handlers\base.py, line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ … Local vars C:\Users\lau\Desktop\Projects\garage_system\billing\views.py, line 156, in generate_invoice invoice = billing.invoice # Access related Invoice using the 'invoice' attribute ^^^^^^^^^^^^^^^ def generate_invoice(request, billing_id): # Get the Billing instance using billing_id billing = get_object_or_404(Billing, id=billing_id) # Access the associated Invoice directly invoice = billing.invoice # Access related Invoice using the 'invoice' attribute # Pass both 'invoice' and 'billing' to the template return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

The error you are encountering (RelatedObjectDoesNotExist) occurs because the Billing object with id=5 does not have an associated Invoice object when you try to access it in the generate_invoice view.

To resolve this issue, you need to ensure that an Invoice is created and associated with the Billing object before trying to access it. There are several ways to handle this, and here are some suggestions for debugging and resolving the issue:

1. Check If Invoice Exists Before Accessing It

You can modify your generate_invoice view to check if an invoice exists before trying to access it, and handle the case where it does not exist.

Update `generate_invoice` View:

python
def generate_invoice(request, billing_id):
    # Get the Billing instance using billing_id
    billing = get_object_or_404(Billing, id=billing_id)

    # Check if the Billing has an associated Invoice
    if not billing.invoice:
        # Handle the case where no invoice exists
        # You can either create the invoice or display an error message
        return render(request, "billing/error.html", {"message": "No invoice found for this billing."})

    # Access the associated Invoice directly
    invoice = billing.invoice

    # Pass both 'invoice' and 'billing' to the template
    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

This modification checks if billing.invoice exists, and if not, it renders an error template or performs any other necessary action, such as creating the invoice if that's the expected behavior.

2. Automatically Create an Invoice if Not Exists

If your business logic requires that an invoice is automatically created when accessing the billing details, you can add code to automatically create the invoice when none exists.

Modify `generate_invoice` to Create Invoice if Missing:

python
def generate_invoice(request, billing_id):
    # Get the Billing instance using billing_id
    billing = get_object_or_404(Billing, id=billing_id)

    # Check if the Billing has an associated Invoice
    if not billing.invoice:
        # Create the invoice if it doesn't exist
        invoice_number = f"INV-{billing.id}"  # Generate a unique invoice number
        invoice = Invoice.objects.create(
            billing=billing,
            invoice_number=invoice_number,
            total_amount=billing.total_cost,  # Assuming the total cost is stored in billing
            date_created=timezone.now(),
        )
        # Optionally, you can log this creation or display a success message
        # logger.debug(f"Invoice created for billing ID: {billing.id}")
    else:
        # If invoice exists, use the existing invoice
        invoice = billing.invoice

    # Pass both 'invoice' and 'billing' to the template
    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

This approach ensures that if the Billing object doesn't have an associated Invoice, it will be created before rendering the invoice page. You can customize this logic to fit your specific requirements.

3. Check the Database for Missing Invoices

You can also check the database directly to verify if the Billing with id=5 has an associated Invoice:

Open the Django shell:
```
bash
python manage.py shell
```

Run the following commands to inspect the Billing and Invoice objects:

python
from billing.models import Billing, Invoice

# Check the Billing object
billing = Billing.objects.get(id=5)
print(billing)

# Check if it has an associated Invoice
if billing.invoice:
    print(billing.invoice)
else:
    print("No invoice associated with this billing.")

This will help you confirm whether the Billing object with id=5 has an associated Invoice.

4. Ensure Invoice Creation During Billing Creation

To avoid this issue in the future, ensure that an Invoice is created whenever a Billing object is created. This could be done in the logic where the Billing object is initially created or updated (e.g., in the create_billing view). Here’s how you can make sure the Invoice is created at that time:

Update `create_billing` View to Ensure Invoice Creation:

python
@login_required
def create_billing(request, booking_id):
    """Generates a billing record after a booking is made."""
    booking = get_object_or_404(Booking, id=booking_id)
    booked_service = booking.service
    vehicle = booking.vehicle
    parts = Part.objects.all()

    if request.method == "POST":
        part_id = request.POST.get("part")
        selected_part = Part.objects.get(id=part_id) if part_id else None
        payment_method = request.POST.get("payment_method")
        payment_amount = float(request.POST.get("payment_amount", 0))

        # Calculate total cost
        total_cost = booked_service.cost + (selected_part.cost if selected_part else 0)

        # Create or update the Billing object
        billing, created = Billing.objects.update_or_create(
            booking=booking,
            defaults={
                "part": selected_part,
                "payment_method": payment_method,
                "payment_amount": payment_amount,
                "total_cost": total_cost,
            },
        )

        # Ensure an Invoice is created for the Billing if it doesn't already exist
        if not billing.invoice:
            invoice_number = f"INV-{billing.id}"  # Generate invoice number
            invoice = Invoice.objects.create(
                billing=billing,
                invoice_number=invoice_number,
                total_amount=billing.total_cost,
                date_created=timezone.now(),
            )

        return redirect("generate_invoice", billing_id=billing.id)

    return render(
        request,
        "billing/create_billing.html",
        {
            "vehicle": vehicle,
            "booked_service": booked_service,
            "parts": parts,
        },
    )

This ensures that every time a Billing record is created or updated, an associated Invoice is also created if one doesn’t exist.

Conclusion:

Check for invoice existence: Ensure that you handle the case where an invoice is missing when accessing a Billing object.
Automatically create an invoice: If necessary, automatically create an invoice when accessing billing data.
Ensure consistent creation of invoices: Make sure invoices are created during billing creation or updates.

These changes should help you resolve the RelatedObjectDoesNotExist error. Let me know if you need further assistance!

To import timezone in Django, you should use:

python
from django.utils import timezone

This imports the timezone module from Django, which provides utilities for working with time-related data, including creating timestamps with the correct timezone.

Make sure that when you're creating or updating datetime fields, you use timezone.now() to ensure that it correctly handles timezone-aware datetimes.

Here's how you would integrate it into your code:

python
from django.utils import timezone

# Example: Creating an Invoice with the current time
invoice = Invoice.objects.create(
    billing=billing,
    invoice_number=invoice_number,
    total_amount=billing.total_cost,
    date_created=timezone.now(),  # Use timezone-aware datetime
)

This will give you the current time according to the timezone settings of your Django project.

Let me know if you need more clarification on this!

>>> from django.utils import timezone >>> >>> # Example: Creating an Invoice with the current time >>> invoice = Invoice.objects.create( ... billing=billing, ... invoice_number=invoice_number, ... total_amount=billing.total_cost, ... date_created=timezone.now(), # Use timezone-aware datetime ... ) Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Invoice' is not defined >>> >>>

The error indicates that the Invoice model is not defined in the current shell session. To resolve this, you need to import the Invoice model before creating an instance.

Try the following steps:

Import the Invoice model.
Create the invoice instance using timezone.now() as shown in the example.

Here is the correct flow:

python
from billing.models import Invoice  # Import the Invoice model
from django.utils import timezone  # Import the timezone module

# Assuming 'billing' and 'invoice_number' are already defined
invoice = Invoice.objects.create(
    billing=billing,
    invoice_number=invoice_number,
    total_amount=billing.total_cost,
    date_created=timezone.now(),  # Use timezone-aware datetime
)

Ensure you have the billing object and invoice_number ready before executing this.

Let me know if this works or if you need further assistance!

Traceback (most recent call last): File "<console>", line 1, in <module> NameError: name 'Invoice' is not defined >>> >>> from billing.models import Invoice # Import the Invoice model >>> from django.utils import timezone # Import the timezone module >>> >>> # Assuming 'billing' and 'invoice_number' are already defined >>> invoice = Invoice.objects.create( ... billing=billing, ... invoice_number=invoice_number, ... total_amount=billing.total_cost, ... date_created=timezone.now(), # Use timezone-aware datetime ... ) Traceback (most recent call last): File "<console>", line 2, in <module> NameError: name 'billing' is not defined >>> >>>

The error NameError: name 'billing' is not defined means that the billing object isn't defined in your shell session. You need to first retrieve a valid Billing object before you can create an Invoice associated with it.

Here’s how to define the billing object (make sure to adjust the billing_id to an actual ID from your database):

python
from billing.models import Billing, Invoice  # Import the necessary models
from django.utils import timezone

# Fetch an existing Billing instance
billing_id = 1  # Use a valid billing ID from your database
billing = Billing.objects.get(id=billing_id)  # Fetch the Billing object

# Create an invoice for the Billing object
invoice_number = f"INV-{billing.id}"  # Example invoice number
invoice = Invoice.objects.create(
    billing=billing,
    invoice_number=invoice_number,
    total_amount=billing.total_cost,
    date_created=timezone.now(),  # Use timezone-aware datetime
)

print("Invoice created:", invoice)

Steps:

Make sure billing_id refers to an existing Billing record in your database.
After fetching the billing object, you can then create the Invoice instance.

Let me know if you need any further assistance!

>>> # Fetch an existing Billing instance >>> billing_id = 1 # Use a valid billing ID from your database >>> billing = Billing.objects.get(id=billing_id) # Fetch the Billing object >>> >>> # Create an invoice for the Billing object >>> invoice_number = f"INV-{billing.id}" # Example invoice number >>> invoice = Invoice.objects.create( ... billing=billing, ... invoice_number=invoice_number, ... total_amount=billing.total_cost, ... date_created=timezone.now(), # Use timezone-aware datetime ... ) >>> >>> print("Invoice created:", invoice) Invoice created: Invoice #INV-1 - Unpaid >>>

It looks like the invoice was successfully created with the following details:

Invoice Number: #INV-1
Status: Unpaid (as per the default setting)

This means the issue with missing invoices should be resolved. You can now proceed with generating the invoice or any further actions related to it.

Would you like to continue with other tasks, or is there anything else you'd like to check or update in your setup?

Given that you're still encountering the error despite successfully creating an invoice using the shell, let's follow a structured approach to debug and resolve the issue systematically.

1. Confirm if the Invoice was Created

Even though the shell shows that the invoice was created, let's confirm that the Invoice object is actually linked to the Billing instance. This could be the root cause of the issue.

In your shell, run the following to verify the invoice associated with the Billing instance:

python
billing_id = 5  # Use the billing ID that you're having trouble with
billing = Billing.objects.get(id=billing_id)

# Check if the billing instance has an associated invoice
print(billing.invoice)  # This should print the related invoice if one exists

If you see None or an error: This confirms that no invoice was linked to the Billing object properly.
If you see an invoice object: Then the problem lies elsewhere (perhaps in how you're querying or rendering the invoice in the generate_invoice view).

2. Ensure Invoice is Created When Needed

In the create_billing view (or wherever the billing is created), ensure that the invoice is created if it doesn't already exist, like so:

python
if not billing.invoice:  # Ensure the invoice is created
    invoice_number = f"INV-{billing.id}"  # Example invoice number
    invoice = Invoice.objects.create(
        billing=billing,
        invoice_number=invoice_number,
        total_amount=billing.total_cost,
        date_created=timezone.now(),  # Use timezone-aware datetime
    )

This ensures that an invoice is always created when the billing is saved, even if one does not exist at that point.

3. Double-Check Your `generate_invoice` View

In the view that processes the generate_invoice URL, ensure that you're correctly checking whether the Billing object has an associated invoice.

Here’s an improved version of your generate_invoice view to handle the case where no invoice exists:

python
def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)

    # Ensure invoice exists before proceeding
    if not billing.invoice:
        # Optionally, create an invoice if none exists (this could be done as part of your billing process)
        invoice_number = f"INV-{billing.id}"  # Generate invoice number
        invoice = Invoice.objects.create(
            billing=billing,
            invoice_number=invoice_number,
            total_amount=billing.total_cost,
            date_created=timezone.now(),
        )
    else:
        invoice = billing.invoice  # Fetch existing invoice

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

4. Force Database Consistency

Sometimes, especially when running migrations or creating related models in Django, database records can get out of sync. If the issue persists, try the following:

Re-run migrations to ensure everything is up to date:

bash
python manage.py makemigrations
python manage.py migrate

Check the Billing and Invoice models in the database to confirm that the foreign key relationship between Billing and Invoice is correct.

5. Verify Database Entries

Finally, manually check the database to see if the Billing instance with id=5 has a related Invoice. You can do this either using the Django shell:

python
billing = Billing.objects.get(id=5)
print(billing.invoice)  # See if it's None or has an invoice associated

Or directly via your database management system (e.g., SQLite, PostgreSQL).

Next Steps

Run the checks to confirm whether the Invoice is being created and linked correctly.
If it's not, add the logic to automatically create an invoice when needed (as shown in the generate_invoice view).
Ensure database consistency with migrations and verify related records.

Let me know how it goes after these checks, and we can continue debugging from there if necessary!

def generate_invoice_number(): """Generates a unique invoice number in the format INV-YYYYMMDD-XXX.""" today = datetime.today().strftime("%Y%m%d") last_invoice = Invoice.objects.filter(invoice_number__startswith=f"INV-{today}").order_by("-invoice_number").first() new_number = (int(last_invoice.invoice_number.split("-")[-1]) + 1) if last_invoice else 1 return f"INV-{today}-{new_number:03d}" def generate_invoice(request, billing_id): billing = get_object_or_404(Billing, id=billing_id) # Ensure invoice exists before proceeding if not billing.invoice: # Optionally, create an invoice if none exists (this could be done as part of your billing process) invoice_number = f"INV-{billing.id}" # Generate invoice number invoice = Invoice.objects.create( billing=billing, invoice_number=invoice_number, total_amount=billing.total_cost, date_created=timezone.now(), ) else: invoice = billing.invoice # Fetch existing invoice return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing}) what is the difference between the 2 functions

The two functions you provided have distinct purposes and behaviors. Let’s break them down:

1. `generate_invoice_number()`:

This function is responsible for generating a unique invoice number in the format INV-YYYYMMDD-XXX.

Purpose: It generates a new invoice number based on today's date (YYYYMMDD), appending a sequential number (XXX) to ensure uniqueness.
How it works:
- It first formats today's date as YYYYMMDD using strftime.
- Then, it queries the Invoice model to find the most recent invoice number that starts with INV-YYYYMMDD. This ensures that the new invoice number will follow the last one created on the same day.
- It extracts the last three digits from the most recent invoice number, increments it by 1, and formats it to ensure it's always three digits (e.g., 001, 002).
- If no invoice exists for today, it starts from INV-YYYYMMDD-001.
Example Output:
- If today is April 2, 2025, and it's the first invoice of the day, the result would be INV-20250402-001.
- If it's the second invoice, it would be INV-20250402-002, and so on.

Usage: This function would be useful for generating an invoice number when creating a new invoice in your system, ensuring it's unique and formatted consistently.

2. `generate_invoice()` (The View):

This function handles the generation of the invoice for a specific billing instance and renders it for display.

Purpose: It checks if an invoice already exists for a given Billing object. If no invoice exists, it creates a new one. The view then renders the invoice information to the user.
How it works:
- The function accepts a billing_id and retrieves the corresponding Billing object using get_object_or_404.
- It then checks whether this Billing object already has an associated Invoice. If no invoice exists, it creates a new invoice using a generated invoice number (here it's just INV-{billing.id}, though it should ideally use the generate_invoice_number() function for proper sequential generation).
- The Invoice is created with the billing information (total_cost, billing, etc.), and the date_created is set to the current time.
- Finally, it renders an HTML template (billing/invoice.html) with the invoice and billing context variables, making the invoice information available to the front-end.

Usage: This function would be used as a view to be triggered via an HTTP request to generate and view an invoice for a specific billing record. It ensures that each billing has an associated invoice and makes the invoice available for display.

Key Differences:

Purpose:
- generate_invoice_number(): Generates a unique invoice number based on today's date and the most recent invoice created.
- generate_invoice(): Handles the creation of an invoice for a specific billing record and ensures that the invoice is generated if it doesn't exist.
Functionality:
- generate_invoice_number(): Just generates a string that represents the invoice number.
- generate_invoice(): Handles the logic of checking whether an invoice exists for a given billing, creates the invoice if necessary, and returns it in the response to be rendered.
Creation of Invoice:
- generate_invoice_number() is used within generate_invoice() to create a unique invoice number, whereas generate_invoice() creates the actual Invoice object and performs the business logic for generating and displaying the invoice.
Return Value:
- generate_invoice_number() returns a string (the invoice number).
- generate_invoice() returns a rendered HTML response with the invoice data.

Suggested Improvements:

In the generate_invoice() view, instead of hardcoding the invoice number as f"INV-{billing.id}", it would be better to use the generate_invoice_number() function to generate a unique invoice number, like this:

python
def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)

    # Ensure invoice exists before proceeding
    if not billing.invoice:
        # Use the generate_invoice_number function to get a unique invoice number
        invoice_number = generate_invoice_number()  # Get unique invoice number
        invoice = Invoice.objects.create(
            billing=billing,
            invoice_number=invoice_number,
            total_amount=billing.total_cost,
            date_created=timezone.now(),
        )
    else:
        invoice = billing.invoice  # Fetch existing invoice

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

This would ensure that the invoice number follows the desired INV-YYYYMMDD-XXX format.

def generate_invoice(request, billing_id): billing = get_object_or_404(Billing, id=billing_id) # Ensure invoice exists before proceeding if not billing.invoice: # Use the generate_invoice_number function to get a unique invoice number invoice_number = generate_invoice_number() # Get unique invoice number invoice = Invoice.objects.create( billing=billing, invoice_number=invoice_number, total_amount=billing.total_cost, date_created=timezone.now(), ) else: invoice = billing.invoice # Fetch existing invoice return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing}) <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Invoice - {{ invoice.invoice_number }}</title> <style> body { font-family: Arial, sans-serif; max-width: 800px; margin: 20px auto; padding: 20px; border: 1px solid #ddd; border-radius: 8px; background-color: #f9f9f9; } h1 { color: #333; text-align: center; } .invoice-header { text-align: center; padding: 10px; background: #007bff; color: #fff; border-radius: 8px 8px 0 0; } .invoice-details { padding: 15px; background: #fff; border-radius: 0 0 8px 8px; } .info { margin-bottom: 10px; } table { width: 100%; border-collapse: collapse; margin-top: 15px; } table, th, td { border: 1px solid #ddd; } th, td { padding: 10px; text-align: left; } th { background: #007bff; color: #fff; } .total { font-size: 18px; font-weight: bold; text-align: right; margin-top: 20px; } </style> </head> <body> <div class="invoice-header"> <h1>Invoice: {{ invoice.invoice_number }}</h1> </div> <div class="invoice-details"> <p class="info"><strong>Date:</strong> {{ invoice.date_created }}</p> <p class="info"><strong>Payment Status:</strong> {{ invoice.payment_status }}</p> <h3>Billing Details:</h3> <p><strong>Vehicle:</strong> {% if billing.booking.vehicle %}{{ billing.booking.vehicle.registration_number }} ({{ billing.booking.vehicle.make }} {{ billing.booking.vehicle.model }}){% else %}Not Available{% endif %}</p> <table> <thead> <tr> <th>Service/Part</th> <th>Cost (KSH)</th> <th>Quantity</th> <th>Total (KSH)</th> </tr> </thead> <tbody> <tr> <td>{{ billing.booking.service.name }}</td> <td>{{ billing.booking.service.cost }}</td> <td>{{ billing.part_quantity }}</td> <td>{{ billing.booking.service.cost|add:billing.part_quantity }}</td>  </tr> {% if billing.part %} <tr> <td>{{ billing.part.name }}</td> <td>{{ billing.part.cost }}</td> <td>{{ billing.part_quantity }}</td> <td>{{ billing.part.cost|floatformat:2|add:billing.part_quantity }}</td> </tr> {% endif %} </tbody> </table> <p class="total">Total Amount: KSH {{ invoice.total_amount }}</p> </div> </body> </html> here is my invoice.html what am i really missing RelatedObjectDoesNotExist at /billing/generate_invoice/5/ Billing has no invoice. Request Method: GET Request URL: http://127.0.0.1:8000/billing/generate_invoice/5/ Django Version: 5.1.7 Exception Type: RelatedObjectDoesNotExist Exception Value: Billing has no invoice. Exception Location: C:\Users\lau\Desktop\Projects\garage_system\venv\Lib\site-packages\django\db\models\fields\related_descriptors.py, line 531, in __get__ Raised during: billing.views.generate_invoice Python Executable: C:\Users\lau\Desktop\Projects\garage_system\venv\Scripts\python.exe Python Version: 3.12.4 Python Path: ['C:\\Users\\lau\\Desktop\\Projects\\garage_system', 'C:\\Program Files\\Python312\\python312.zip', 'C:\\Program Files\\Python312\\DLLs', 'C:\\Program Files\\Python312\\Lib', 'C:\\Program Files\\Python312', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv', 'C:\\Users\\lau\\Desktop\\Projects\\garage_system\\venv\\Lib\\site-packages'] Server time: Wed, 02 Apr 2025 14:02:29 +0000

The error you’re seeing (RelatedObjectDoesNotExist: Billing has no invoice) occurs when the code attempts to access the invoice related field on a Billing object, but the Billing object does not have an associated Invoice.

Here’s how we can approach solving the problem:

1. Ensure the Invoice is Created for Billing

The generate_invoice() function should create an invoice if one doesn't exist for the given Billing. You’ve already added logic for creating an invoice if it doesn't exist, but you still see the error, which indicates that the check to create the invoice might not be working properly.

Make sure the invoice creation logic in your view is working correctly. Double-check the following:

Ensure that the Invoice model is properly related to the Billing model. Specifically, the Billing model should have a ForeignKey or OneToOneField linking it to Invoice (e.g., billing.invoice).
Confirm that there is no issue with the database integrity. Sometimes, database constraints might cause the relationship to not work as expected.

Here's a modified version of your generate_invoice() function that ensures proper handling:

python
def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)

    # Ensure invoice exists before proceeding
    if not billing.invoice:
        # Use the generate_invoice_number function to get a unique invoice number
        invoice_number = generate_invoice_number()  # Get unique invoice number
        invoice = Invoice.objects.create(
            billing=billing,
            invoice_number=invoice_number,
            total_amount=billing.total_cost,
            date_created=timezone.now(),
        )
        # Save the invoice to the billing instance
        billing.invoice = invoice
        billing.save()  # This is important if the billing model needs to reference the invoice explicitly.
    else:
        invoice = billing.invoice  # Fetch existing invoice

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

2. Review the `Billing` Model Relationship

Ensure that your Billing model has a relationship with the Invoice model. The error suggests that the billing.invoice is being accessed, but no Invoice exists for this Billing. Here's what you should check:

python
class Billing(models.Model):
    # Other fields here
    invoice = models.OneToOneField('Invoice', on_delete=models.CASCADE, related_name='billing', null=True, blank=True)

In the above example, I assume you are using a OneToOneField to link each Billing to a unique Invoice. If the invoice field is nullable, you must ensure that it’s not None before trying to access it.

3. Confirm Invoice Creation

If the Billing object has an associated Invoice, the view will not create a new invoice. However, if the Billing object has no invoice and the invoice creation logic is triggered, make sure the database is correctly saving the newly created invoice and linking it to the Billing.

4. Check Your HTML Template

Your HTML template seems fine, but to avoid issues, you can check if the invoice exists before trying to render it:

html
<div class="invoice-header">
    <h1>Invoice: {% if invoice %}{{ invoice.invoice_number }}{% else %}Not Available{% endif %}</h1>
</div>

<!-- The rest of the template -->

This will avoid errors when an Invoice is not yet created and provides fallback text when the invoice is not available.

5. Database Consistency

To ensure your database and models are synchronized:

Run python manage.py makemigrations and python manage.py migrate to ensure all model changes are applied correctly.
Check your database to ensure there’s no corruption in the Billing and Invoice tables, particularly the foreign key relationship.

By following these steps, you should be able to resolve the error where the Billing object has no Invoice associated. Let me know if you continue to face issues after applying these suggestions!

Your models.py file looks mostly good, but there are a few points worth reviewing or improving. Here's a breakdown and recommendations:

1. `Billing` Model

Related Name for Booking: The related_name for booking in Billing is set to "bookings", but the model is already defined as Booking. This can cause confusion. It's better to use a different name for clarity. You may want to set related_name="billings" instead.

python
class Billing(models.Model):
    booking = models.ForeignKey(Booking, on_delete=models.CASCADE, null=True, blank=True, related_name="billings")

Nullability for total_cost: You are setting total_cost to null=True, but you also ensure it gets a value in the save method. While this ensures total_cost isn't left empty, it could be better to define total_cost with blank=True rather than null=True, as a DecimalField should typically not have null values, but rather an empty or zero value if not calculated.

python
total_cost = models.DecimalField(max_digits=10, decimal_places=2, blank=True)

You can safely keep the blank=True, and the save() method will ensure that it's always set before saving.

2. `Invoice` Model

The Invoice model has a solid design, but there are some areas for improvement:

Saving the invoice_number and total_amount: The logic for generating the invoice number in the save method is correct. However, it's important to ensure that the total_amount is correctly set before the first save operation. Since you need to generate the invoice_number after the model is created, you can save it in two passes, as you're doing now.

Here's an improved version of the Invoice model with some slight modifications:

python
class Invoice(models.Model):
    billing = models.OneToOneField(Billing, on_delete=models.CASCADE)
    invoice_number = models.CharField(max_length=50, unique=True, blank=True)
    date_created = models.DateTimeField(auto_now_add=True)
    total_amount = models.DecimalField(max_digits=10, decimal_places=2)
    payment_status = models.CharField(max_length=20, choices=[('Paid', 'Paid'), ('Unpaid', 'Unpaid')], default='Unpaid')

    def __str__(self):
        return f"Invoice #{self.invoice_number} - {self.payment_status}"

    def generate_invoice_number(self):
        # Generates a unique invoice number based on the ID and date
        return f"INV-{self.id}"

    def save(self, *args, **kwargs):
        if not self.invoice_number:
            super().save(*args, **kwargs)  # Save first to get a PK
            self.invoice_number = self.generate_invoice_number()
        self.total_amount = self.billing.total_cost  # Ensure total amount is copied
        super().save(*args, **kwargs)  # Save again with invoice number

3. Foreign Key Constraints

Nullability of Foreign Key fields: You are using on_delete=models.SET_NULL for Part in the Billing model, which is perfectly fine if a part can be optional. However, this may cause some complications if you’re querying related objects and expect all parts to be present in the billing. If you want to ensure that the Part is mandatory for Billing, then you should remove null=True from the part field.

4. Calculate `total_cost` Logic

Your logic for calculating the total_cost seems correct: you sum up the service cost and the part cost (if a part exists). However, as you have null=True in your total_cost, you should handle cases where self.booking might be None. You’ve already done this check in the calculate_total() method, which is good.

5. Custom User Model Reference (`CustomUser`)

In the Customer model, you're using CustomUser for the user field. Make sure that the CustomUser model is properly set up and included in your settings.py file (i.e., AUTH_USER_MODEL = 'accounts.CustomUser').

Conclusion

Overall, your models seem well-structured. The main things to focus on are:

Ensuring the related_name in Billing is correctly set for clarity.
Modifying the total_cost field to avoid null=True and potentially use blank=True.
Checking that foreign keys like part and booking are correctly handled, especially for optional fields.

After these minor adjustments, your code should be even more robust and clear! Let me know if you need any further changes or clarifications.

After making the suggested changes to your models, the next steps are as follows:

1. Apply Migrations

Whenever you modify your models (adding or modifying fields), you'll need to create and apply migrations to ensure the changes are reflected in your database schema.

Create migrations:

bash
python manage.py makemigrations

Apply migrations:

bash
python manage.py migrate

This ensures that your database schema is updated with the new or modified fields.

2. Testing the Changes

After applying migrations, you should test that the new functionality works as expected. Here’s a checklist to go through:

Creating a Billing object: Test if the Billing object is created correctly with a total_cost being calculated automatically.
Creating an Invoice: Ensure that when you create an Invoice, it automatically generates a valid invoice_number and associates the correct total_amount from the Billing object.
View the Invoice Page: Test the view that generates an invoice, ensuring it properly displays the invoice number, total amount, and associated billing details.

You can do this by manually creating instances in the Django admin or through the Django shell. Example:

bash
python manage.py shell

Then create a Billing and check if the associated Invoice is created automatically when generating it.

3. Update Your Views

You may want to adjust your generate_invoice view slightly to reflect the changes made to your models. For example, ensure that you’re properly handling cases where an invoice already exists.

If you haven’t already, consider this structure in your view:

python
def generate_invoice(request, billing_id):
    billing = get_object_or_404(Billing, id=billing_id)

    # Ensure invoice exists before proceeding
    if not billing.invoice:
        # Use the generate_invoice_number function to get a unique invoice number
        invoice_number = generate_invoice_number()  # Get unique invoice number
        invoice = Invoice.objects.create(
            billing=billing,
            invoice_number=invoice_number,
            total_amount=billing.total_cost,
            date_created=timezone.now(),
        )
    else:
        invoice = billing.invoice  # Fetch existing invoice

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

4. Testing the Template Rendering

Ensure that the data in your template (invoice.html) renders correctly:

Check the invoice.invoice_number: Verify that the correct invoice number is displayed.
Display the billing information: Make sure that the vehicle information, services, and total amounts are correctly shown.

5. Error Handling

If you encounter any issues with RelatedObjectDoesNotExist, it could be because an invoice wasn’t created correctly for a billing record or some missing related fields. Double-check that your logic for creating the invoice is properly handling all edge cases where there might not be an associated invoice.

6. Use Django Admin or Forms for Easy Access

For easier testing and management, consider using Django’s admin interface to access Billing and Invoice objects. Make sure that Billing objects have a corresponding Invoice and that invoices are automatically created when you generate them.

Ensure that the Invoice model is registered in the admin if you want to manage it via the admin interface.

python
from django.contrib import admin
from .models import Invoice

admin.site.register(Invoice)

7. Test the Complete Workflow

Finally, test the full flow:

Create a Booking and Billing.
Verify that the Invoice is generated automatically.
Access the invoice via the URL (e.g., /billing/generate_invoice/{id}/) and check if it renders properly with the correct data.

Summary of Changes:

Apply migrations after modifying models.
Test the creation of Billing and Invoice instances.
Verify that the generate_invoice view works as expected.
Confirm that the invoice details render correctly in the template.
Test using Django admin and ensure proper relationships between models.

Let me know if you encounter any issues during the testing process or if you need further adjustments!

The error message you're encountering (RelatedObjectDoesNotExist: Billing has no invoice.) is occurring because you're attempting to access the invoice related field of a Billing object, but there is no associated Invoice for that Billing record.

In Django, when you define a OneToOneField (like the invoice field in your Billing model), attempting to access the related object (in this case, billing.invoice) will raise a RelatedObjectDoesNotExist exception if the related object doesn't exist.

To fix this error, you can modify your view logic to handle the case when there is no related Invoice for a Billing object. You can check if an Invoice exists, and if not, create it.

Solution

You need to ensure that before accessing the invoice field, you check if the related Invoice exists. If it does not exist, create one. Here's how you can modify your view to handle this:

python
from django.shortcuts import get_object_or_404, render
from django.utils import timezone
from .models import Billing, Invoice
from .utils import generate_invoice_number  # Assuming this is your helper function for invoice numbers

def generate_invoice(request, billing_id):
    # Get the Billing object, or return 404 if not found
    billing = get_object_or_404(Billing, id=billing_id)

    try:
        # Attempt to access the related Invoice
        invoice = billing.invoice
    except Invoice.DoesNotExist:
        # If the Invoice does not exist, create one
        invoice_number = generate_invoice_number()  # Generate a unique invoice number
        invoice = Invoice.objects.create(
            billing=billing,
            invoice_number=invoice_number,
            total_amount=billing.total_cost,
            date_created=timezone.now(),
        )

    return render(request, "billing/invoice.html", {"invoice": invoice, "billing": billing})

Explanation:

Try-Except Block: This catches the Invoice.DoesNotExist exception. When there is no related Invoice for a Billing, it handles the error gracefully and proceeds to create the Invoice for that Billing.
Invoice Creation: If no Invoice exists, it generates a new one using the generate_invoice_number() function and the total_cost from the Billing.
Render the Template: Finally, it passes both the invoice and billing to the template for rendering.

Additional Considerations:

Transaction Management: If your application allows for multiple invoice generations or edits, consider wrapping the creation of the invoice in a database transaction using django.db.transaction.atomic() to ensure consistency between the Billing and Invoice objects.
Testing: After making these changes, test the workflow by attempting to generate an invoice for a Billing without an associated invoice, and ensure that the Invoice is correctly created.

Let me know if this resolves the issue or if further adjustments are needed!

{% extends 'core/base.html' %} {% load static %} {% block content %}  <section class="hero bg-dark text-white text-center py-5"> <div class="container"> <h1 class="display-4">Welcome to Our Garage</h1> <p class="lead">Professional car repairs, maintenance, and servicing.</p> <a href="{% url 'services:services' %}" class="btn btn-warning btn-lg">Explore Services</a> </div> </section>  <section class="about py-5"> <div class="container text-center"> <h2>About Us</h2> <p>We provide top-quality automotive repairs, servicing, and diagnostics. Our skilled mechanics ensure your vehicle runs smoothly.</p> </div> </section>  <section class="services bg-light py-5"> <div class="container"> <h2 class="text-center">Our Services</h2> <div class="row text-center"> <div class="col-md-4"> <img src="{% static 'images/oil.png' %}" alt="Oil Change" class="img-fluid" width="100"> <h4>Oil Change</h4> <p>Keep your engine running smoothly with our professional oil change services.</p> </div> <div class="col-md-4"> <img src="{% static 'images/diagnostics.png' %}" alt="Diagnostics" class="img-fluid" width="100"> <h4>Car Diagnostics</h4> <p>State-of-the-art diagnostics to identify and fix any issues.</p> </div> <div class="col-md-4"> <img src="{% static 'images/repair.png' %}" alt="Repairs" class="img-fluid" width="100"> <h4>Repairs & Maintenance</h4> <p>From minor fixes to major repairs, we’ve got you covered.</p> </div> </div> </div> </section>  <section class="booking text-center py-5"> <div class="container"> <h2>Book an Appointment</h2> <p>Need a service? Schedule an appointment today.</p> <a href="{% url 'booking' %}" class="btn btn-primary btn-lg">Book Now</a> </div> </section>  <section class="contact bg-dark text-white text-center py-4"> <div class="container"> <h3>Contact Us</h3> <p>📍 123 Garage Street, City, Country</p> <p>📞 +123 456 7890 | ✉ info@garage.com</p> <p>🕒 Mon-Sat: 8 AM - 6 PM</p> </div> </section> {% endblock %} please design the ui to be very neat and well placed

To enhance the layout of the webpage, I'll make some improvements to the UI design by adding better spacing, alignment, and responsiveness, which will make it more visually appealing and user-friendly.

Here’s the improved HTML with added classes for better UI design using Bootstrap (you can also tweak the CSS to match your specific design preferences):

html
{% extends 'core/base.html' %}
{% load static %}
{% block content %}
<!-- Hero Section -->
<section class="hero bg-dark text-white text-center py-5 mb-5">
    <div class="container">
        <h1 class="display-4 font-weight-bold">Welcome to Our Garage</h1>
        <p class="lead mb-4">Professional car repairs, maintenance, and servicing.</p>
        <a href="{% url 'services:services' %}" class="btn btn-warning btn-lg">Explore Services</a>
    </div>
</section>

<!-- About Section -->
<section class="about py-5 bg-light">
    <div class="container text-center">
        <h2 class="font-weight-bold mb-4">About Us</h2>
        <p class="lead mb-4">We provide top-quality automotive repairs, servicing, and diagnostics. Our skilled mechanics ensure your vehicle runs smoothly.</p>
    </div>
</section>

<!-- Services Overview -->
<section class="services py-5">
    <div class="container">
        <h2 class="text-center font-weight-bold mb-5">Our Services</h2>
        <div class="row text-center">
            <div class="col-md-4 mb-4">
                <div class="service-box">
                    <img src="{% static 'images/oil.png' %}" alt="Oil Change" class="img-fluid mb-3" width="100">
                    <h4 class="font-weight-bold">Oil Change</h4>
                    <p>Keep your engine running smoothly with our professional oil change services.</p>
                </div>
            </div>
            <div class="col-md-4 mb-4">
                <div class="service-box">
                    <img src="{% static 'images/diagnostics.png' %}" alt="Diagnostics" class="img-fluid mb-3" width="100">
                    <h4 class="font-weight-bold">Car Diagnostics</h4>
                    <p>State-of-the-art diagnostics to identify and fix any issues.</p>
                </div>
            </div>
            <div class="col-md-4 mb-4">
                <div class="service-box">
                    <img src="{% static 'images/repair.png' %}" alt="Repairs" class="img-fluid mb-3" width="100">
                    <h4 class="font-weight-bold">Repairs & Maintenance</h4>
                    <p>From minor fixes to major repairs, we’ve got you covered.</p>
                </div>
            </div>
        </div>
    </div>
</section>

<!-- Booking Section -->
<section class="booking bg-primary text-white text-center py-5">
    <div class="container">
        <h2 class="font-weight-bold mb-4">Book an Appointment</h2>
        <p class="lead mb-4">Need a service? Schedule an appointment today.</p>
        <a href="{% url 'booking' %}" class="btn btn-light btn-lg">Book Now</a>
    </div>
</section>

<!-- Contact Info -->
<section class="contact bg-dark text-white text-center py-4">
    <div class="container">
        <h3 class="font-weight-bold mb-3">Contact Us</h3>
        <p class="mb-2">📍 123 Garage Street, City, Country</p>
        <p class="mb-2">📞 +123 456 7890 | ✉ info@garage.com</p>
        <p>🕒 Mon-Sat: 8 AM - 6 PM</p>
    </div>
</section>

{% endblock %}

Key Improvements:

Spacing and Alignment:
- Used margin-bottom (mb-4, mb-5) to add spacing between elements for better visual hierarchy.
- Added font-weight-bold for stronger heading emphasis, making the headings stand out more.
Responsive Design:
- The grid is kept responsive using Bootstrap’s grid system (col-md-4). The layout will automatically adjust for smaller screen sizes.
Background Styling:
- Light and dark backgrounds have been balanced to give a professional look. The bg-light class has been applied to the About section to give a soft contrast with the hero section.
Hero Section:
- The hero section has a nice large title and a well-aligned button for CTA (call-to-action). Used mb-5 to give space below the hero section.
Service Section:
- Grouped the service offerings into individual boxes with images, making it cleaner and more appealing. The service-box class will give a neat feel for each service card.
Contact Section:
- The contact section uses a simple, clear design with icons for address, phone, and business hours. It keeps the info organized and legible.
Buttons:
- Styled buttons with Bootstrap classes (btn btn-lg, btn-light, etc.) for consistency across the design. The buttons are large and clearly clickable.

Additional Suggestions:

Fonts: You can customize the fonts by adding a custom font-family in your CSS or using Google Fonts to enhance the visual design.
Hover Effects: You might want to add hover effects to your service cards or buttons to make the interactions more engaging.
Animations: For a dynamic look, consider adding CSS transitions or animations to elements like buttons or service cards when they come into view.

With these changes, your webpage will be clean, visually appealing, and responsive across different screen sizes. Let me know if you need more help!

<div class="service-box"> <img src="{% static 'images/oil.png' %}" alt="Oil Change" class="img-fluid mb-3" width="100"> <h4 class="font-weight-bold">Oil Change</h4> <p>Keep your engine running smoothly with our professional oil change services.</p> </div> how can i modify the image height to be equal to all images for consistency

To ensure that all service images have the same height while maintaining their aspect ratio, you can modify the CSS like this:

Solution:

Add a CSS rule that sets a fixed height for all images inside .service-box while keeping their aspect ratio:

✅ Method 1: Use CSS for Consistent Height

css
.service-box img {
    height: 120px; /* Adjust as needed */
    width: auto; /* Maintain aspect ratio */
    object-fit: contain; /* Ensures the image fits within the given height */
}

This will make all images have the same height while preventing distortion.

✅ Method 2: Use Flexbox to Ensure Uniformity

If the images have different widths and you want them centered and aligned consistently:

css
.service-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.service-box img {
    height: 120px; /* Set a fixed height */
    width: 100px; /* Set a consistent width */
    object-fit: contain; /* Ensures the image scales without distortion */
}

Applying This to Your Code:

Modify your <style> block in the template or add it to your CSS file:

html
<style>
    .service-box img {
        height: 120px;
        width: auto;
        object-fit: contain;
    }
</style>

This ensures that all images in .service-box have the same height without being stretched.

Alternative:

If you want exactly the same width and height for all images:

css
.service-box img {
    height: 120px;
    width: 120px;
    object-fit: cover; /* Crop the image to fill the box */
}

Use contain to fit inside the box without cropping, or cover to make sure the whole box is filled (cropping parts of the image).

Let me know if you need more tweaks! 🚀

please do that to the following code {% extends 'core/base.html' %} {% load static %} {% block content %}  <section class="hero bg-dark text-white text-center py-5 mb-5"> <div class="container"> <h1 class="display-4 font-weight-bold">Welcome to Our Garage</h1> <p class="lead mb-4">Professional car repairs, maintenance, and servicing.</p> <a href="{% url 'services:services' %}" class="btn btn-warning btn-lg">Explore Services</a> </div> </section>  <section class="about py-5 bg-light"> <div class="container text-center"> <h2 class="font-weight-bold mb-4">About Us</h2> <p class="lead mb-4">We provide top-quality automotive repairs, servicing, and diagnostics. Our skilled mechanics ensure your vehicle runs smoothly.</p> </div> </section>  <section class="services py-5"> <div class="container"> <h2 class="text-center font-weight-bold mb-5">Our Services</h2> <div class="row text-center"> <div class="col-md-4 mb-4"> <div class="service-box"> <img src="{% static 'images/oil.png' %}" alt="Oil Change" class="img-fluid mb-3" width="100"> <h4 class="font-weight-bold">Oil Change</h4> <p>Keep your engine running smoothly with our professional oil change services.</p> </div> </div> <div class="col-md-4 mb-4"> <div class="service-box"> <img src="{% static 'images/diagnostics.png' %}" alt="Diagnostics" class="img-fluid mb-3" width="100"> <h4 class="font-weight-bold">Car Diagnostics</h4> <p>State-of-the-art diagnostics to identify and fix any issues.</p> </div> </div> <div class="col-md-4 mb-4"> <div class="service-box"> <img src="{% static 'images/repair.png' %}" alt="Repairs" class="img-fluid mb-3" width="100"> <h4 class="font-weight-bold">Repairs & Maintenance</h4> <p>From minor fixes to major repairs, we’ve got you covered.</p> </div> </div> </div> </div> </section>  <section class="booking bg-primary text-white text-center py-5"> <div class="container"> <h2 class="font-weight-bold mb-4">Book an Appointment</h2> <p class="lead mb-4">Need a service? Schedule an appointment today.</p> <a href="{% url 'booking' %}" class="btn btn-light btn-lg">Book Now</a> </div> </section>  <section class="contact bg-dark text-white text-center py-4"> <div class="container"> <h3 class="font-weight-bold mb-3">Contact Us</h3> <p class="mb-2">📍 123 Garage Street, City, Country</p> <p class="mb-2">📞 +123 456 7890 | ✉ info@garage.com</p> <p>🕒 Mon-Sat: 8 AM - 6 PM</p> </div> </section> {% endblock %}

To ensure that the images in your services section are consistent in height, you can add a simple CSS rule to set the height for all images inside the .service-box class. Here's your updated code with the necessary CSS:

Updated HTML (with inline CSS)

html
{% extends 'core/base.html' %}
{% load static %}
{% block content %}
<!-- Hero Section -->
<section class="hero bg-dark text-white text-center py-5 mb-5">
    <div class="container">
        <h1 class="display-4 font-weight-bold">Welcome to Our Garage</h1>
        <p class="lead mb-4">Professional car repairs, maintenance, and servicing.</p>
        <a href="{% url 'services:services' %}" class="btn btn-warning btn-lg">Explore Services</a>
    </div>
</section>

<!-- About Section -->
<section class="about py-5 bg-light">
    <div class="container text-center">
        <h2 class="font-weight-bold mb-4">About Us</h2>
        <p class="lead mb-4">We provide top-quality automotive repairs, servicing, and diagnostics. Our skilled mechanics ensure your vehicle runs smoothly.</p>
    </div>
</section>

<!-- Services Overview -->
<section class="services py-5">
    <div class="container">
        <h2 class="text-center font-weight-bold mb-5">Our Services</h2>
        <div class="row text-center">
            <div class="col-md-4 mb-4">
                <div class="service-box">
                    <img src="{% static 'images/oil.png' %}" alt="Oil Change" class="img-fluid mb-3">
                    <h4 class="font-weight-bold">Oil Change</h4>
                    <p>Keep your engine running smoothly with our professional oil change services.</p>
                </div>
            </div>
            <div class="col-md-4 mb-4">
                <div class="service-box">
                    <img src="{% static 'images/diagnostics.png' %}" alt="Diagnostics" class="img-fluid mb-3">
                    <h4 class="font-weight-bold">Car Diagnostics</h4>
                    <p>State-of-the-art diagnostics to identify and fix any issues.</p>
                </div>
            </div>
            <div class="col-md-4 mb-4">
                <div class="service-box">
                    <img src="{% static 'images/repair.png' %}" alt="Repairs" class="img-fluid mb-3">
                    <h4 class="font-weight-bold">Repairs & Maintenance</h4>
                    <p>From minor fixes to major repairs, we’ve got you covered.</p>
                </div>
            </div>
        </div>
    </div>
</section>

<!-- Booking Section -->
<section class="booking bg-primary text-white text-center py-5">
    <div class="container">
        <h2 class="font-weight-bold mb-4">Book an Appointment</h2>
        <p class="lead mb-4">Need a service? Schedule an appointment today.</p>
        <a href="{% url 'booking' %}" class="btn btn-light btn-lg">Book Now</a>
    </div>
</section>

<!-- Contact Info -->
<section class="contact bg-dark text-white text-center py-4">
    <div class="container">
        <h3 class="font-weight-bold mb-3">Contact Us</h3>
        <p class="mb-2">📍 123 Garage Street, City, Country</p>
        <p class="mb-2">📞 +123 456 7890 | ✉ info@garage.com</p>
        <p>🕒 Mon-Sat: 8 AM - 6 PM</p>
    </div>
</section>

{% endblock %}

<!-- Custom CSS -->
<style>
    .service-box img {
        height: 120px; /* Set a fixed height */
        width: auto; /* Maintain aspect ratio */
        object-fit: contain; /* Ensures the image fits within the given height */
    }
</style>

Key Changes:

CSS Rule for Consistent Image Height:
- I've added a <style> tag inside your template that applies to the .service-box img class. It sets the height to 120px (you can adjust this to your preference) and ensures the images maintain their aspect ratio with object-fit: contain.
Ensured Consistent Image Dimensions:
- The width: auto; property maintains the aspect ratio, while object-fit: contain; ensures the image fits within the height without being cropped or stretched.

Now, all your service images will have a consistent height while keeping their aspect ratios intact, providing a more visually balanced layout. Let me know if you need further adjustments!

If one image appears taller than the others, it might be due to differences in the original aspect ratios of the images. To fix this, you can ensure that all images have a consistent height and width while preserving their aspect ratio.

Solution: Use `height` and `width` in CSS

Modify your <style> section like this:

css
.service-box img {
    height: 120px;  /* Set a fixed height for consistency */
    width: 120px;   /* Ensures all images have the same width */
    object-fit: cover; /* Ensures images fill the box while maintaining proportions */
    display: block;
    margin: 0 auto; /* Center the images */
}

Explanation:

height: 120px; → Ensures all images are the same height.
width: 120px; → Ensures uniform width.
object-fit: cover; → Makes sure images are cropped proportionally if needed.
display: block; margin: 0 auto; → Centers the images inside their containers.

Now, all images should appear the same size. If the issue persists, try replacing object-fit: cover; with object-fit: contain; to ensure images fit within the box without cropping.

Let me know if you need further adjustments! 🚀

apply the changes in the code below {% extends 'core/base.html' %} {% load static %} {% block content %}  <section class="hero bg-dark text-white text-center py-5 mb-5"> <div class="container"> <h1 class="display-4 font-weight-bold">Welcome to Our Garage</h1> <p class="lead mb-4">Professional car repairs, maintenance, and servicing.</p> <a href="{% url 'services:services' %}" class="btn btn-warning btn-lg">Explore Services</a> </div> </section>  <section class="about py-5 bg-light"> <div class="container text-center"> <h2 class="font-weight-bold mb-4">About Us</h2> <p class="lead mb-4">We provide top-quality automotive repairs, servicing, and diagnostics. Our skilled mechanics ensure your vehicle runs smoothly.</p> </div> </section>  <section class="services py-5"> <div class="container"> <h2 class="text-center font-weight-bold mb-5">Our Services</h2> <div class="row text-center"> <div class="col-md-4 mb-4"> <div class="service-box"> <img src="{% static 'images/oil.png' %}" alt="Oil Change" class="img-fluid mb-3"> <h4 class="font-weight-bold">Oil Change</h4> <p>Keep your engine running smoothly with our professional oil change services.</p> </div> </div> <div class="col-md-4 mb-4"> <div class="service-box"> <img src="{% static 'images/diagnostics.png' %}" alt="Diagnostics" class="img-fluid mb-3"> <h4 class="font-weight-bold">Car Diagnostics</h4> <p>State-of-the-art diagnostics to identify and fix any issues.</p> </div> </div> <div class="col-md-4 mb-4"> <div class="service-box"> <img src="{% static 'images/repair.png' %}" alt="Repairs" class="img-fluid mb-3"> <h4 class="font-weight-bold">Repairs & Maintenance</h4> <p>From minor fixes to major repairs, we’ve got you covered.</p> </div> </div> </div> </div> </section>  <section class="booking bg-primary text-white text-center py-5"> <div class="container"> <h2 class="font-weight-bold mb-4">Book an Appointment</h2> <p class="lead mb-4">Need a service? Schedule an appointment today.</p> <a href="{% url 'booking' %}" class="btn btn-light btn-lg">Book Now</a> </div> </section>  <section class="contact bg-dark text-white text-center py-4"> <div class="container"> <h3 class="font-weight-bold mb-3">Contact Us</h3> <p class="mb-2">📍 123 Garage Street, City, Country</p> <p class="mb-2">📞 +123 456 7890 | ✉ info@garage.com</p> <p>🕒 Mon-Sat: 8 AM - 6 PM</p> </div> </section> {% endblock %}  <style> .service-box img { height: 120px; /* Set a fixed height for consistency */ width: 120px; /* Ensures all images have the same width */ object-fit: cover; /* Ensures images fill the box while maintaining proportions */ display: block; margin: 0 auto; /* Center the images */ } </style>

Your code looks great, and the CSS for image consistency is correctly applied! Here are a few minor refinements to make sure everything works perfectly:

Updated Code with Improvements:

Ensure CSS is within <head> or an external file:
- If you are using inline styles, place them inside {% block extra_css %} in your base template.
- Otherwise, consider adding them to your external stylesheet (styles.css) to keep things clean.

Modified Code:

django
{% extends 'core/base.html' %}
{% load static %}
{% block content %}

<!-- Hero Section -->
<section class="hero bg-dark text-white text-center py-5 mb-5">
    <div class="container">
        <h1 class="display-4 font-weight-bold">Welcome to Our Garage</h1>
        <p class="lead mb-4">Professional car repairs, maintenance, and servicing.</p>
        <a href="{% url 'services:services' %}" class="btn btn-warning btn-lg">Explore Services</a>
    </div>
</section>

<!-- About Section -->
<section class="about py-5 bg-light">
    <div class="container text-center">
        <h2 class="font-weight-bold mb-4">About Us</h2>
        <p class="lead mb-4">We provide top-quality automotive repairs, servicing, and diagnostics. Our skilled mechanics ensure your vehicle runs smoothly.</p>
    </div>
</section>

<!-- Services Overview -->
<section class="services py-5">
    <div class="container">
        <h2 class="text-center font-weight-bold mb-5">Our Services</h2>
        <div class="row text-center">
            <div class="col-md-4 mb-4">
                <div class="service-box">
                    <img src="{% static 'images/oil.png' %}" alt="Oil Change" class="service-image">
                    <h4 class="font-weight-bold">Oil Change</h4>
                    <p>Keep your engine running smoothly with our professional oil change services.</p>
                </div>
            </div>
            <div class="col-md-4 mb-4">
                <div class="service-box">
                    <img src="{% static 'images/diagnostics.png' %}" alt="Diagnostics" class="service-image">
                    <h4 class="font-weight-bold">Car Diagnostics</h4>
                    <p>State-of-the-art diagnostics to identify and fix any issues.</p>
                </div>
            </div>
            <div class="col-md-4 mb-4">
                <div class="service-box">
                    <img src="{% static 'images/repair.png' %}" alt="Repairs" class="service-image">
                    <h4 class="font-weight-bold">Repairs & Maintenance</h4>
                    <p>From minor fixes to major repairs, we’ve got you covered.</p>
                </div>
            </div>
        </div>
    </div>
</section>

<!-- Booking Section -->
<section class="booking bg-primary text-white text-center py-5">
    <div class="container">
        <h2 class="font-weight-bold mb-4">Book an Appointment</h2>
        <p class="lead mb-4">Need a service? Schedule an appointment today.</p>
        <a href="{% url 'booking' %}" class="btn btn-light btn-lg">Book Now</a>
    </div>
</section>

<!-- Contact Info -->
<section class="contact bg-dark text-white text-center py-4">
    <div class="container">
        <h3 class="font-weight-bold mb-3">Contact Us</h3>
        <p class="mb-2">📍 123 Garage Street, City, Country</p>
        <p class="mb-2">📞 +123 456 7890 | ✉ info@garage.com</p>
        <p>🕒 Mon-Sat: 8 AM - 6 PM</p>
    </div>
</section>

{% endblock %}

{% block extra_css %}
<style>
    .service-image {
        height: 120px;  /* Set a fixed height for consistency */
        width: 120px;   /* Ensures all images have the same width */
        object-fit: cover; /* Ensures images fill the box while maintaining proportions */
        display: block;
        margin: 0 auto; /* Center the images */
    }
</style>
{% endblock %}

Changes & Improvements

Changed class="img-fluid mb-3" to class="service-image"
- This prevents Bootstrap from overriding the height settings.
Moved CSS inside {% block extra_css %}
- This ensures styles are applied within your base template where {% block extra_css %} is defined.
Ensured Image Consistency:
- Now, all images will have:
  - Same height: 120px
  - Same width: 120px
  - Proper cropping: Using object-fit: cover;
  - Centered alignment: margin: 0 auto;

Alternative: Use External CSS File

If you are using an external CSS file (e.g., styles.css), just remove the {% block extra_css %} part and add this inside your styles.css:

css
.service-image {
    height: 120px;
    width: 120px;
    object-fit: cover;
    display: block;
    margin: 0 auto;
}

✅ Final Result

All service images will appear equal in height and width ✅
Images are centered properly ✅
Styles are clean and reusable ✅

🚀 Let me know if you need any more tweaks!